Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de22d54a7d3b91c…

MALICIOUS

PDF

98.6 KB Created: 2021-07-01 14:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9419026e341904fa8ed2ce1097fc6394 SHA-1: 77b965fff674ce6cf62e4d30497347eebc9ff449 SHA-256: 3de22d54a7d3b91cbf2f62f61114f05514934527cae03e505b2d37c22445ec75
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a pattern of using compromised web infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=major+and+minor+misconduct PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607904a372a12---gifanazoxipukija.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e85f735c272b42540186dbd2204be504/84060518633.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb7bc3e29---dozidasiwulezokozedim.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b72212de---50007583307.pdfIn PDF document text
    • http://chromoink.com/updates/file/tepowetale.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/35io8v7jro172oba4lgq7u4690/mimilebukeferu.pdfIn PDF document text
    • https://silga.ca/userfiles/file/vuxisaburoxuf.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ec3070f131d2cc72a9dbd0eef96e386b/64305274819.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/waguguw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609901f005e20---golavorekarivifefajo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/16277898516.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a7ddc286585de8e2ebaf2d85f2db3486/24107825013.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0005fdb69b---porimotiwexejoj.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41ea64cf5---nuzijitamatadozesu.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/43780875590.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gjfff8djo89jch0sm0pa86hfrs/wenerogufikaxurizuzazez.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a0965295---tosodemezawuzamod.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/67efcde4c9375d53f34473d01617f2ce/bewixo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8b38ba1087a2b021dc48e38b94a08407/15627005241.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ddaede72f44bbbfdcb4eb84be26f30bd/tajawobexewub.pdfIn PDF document text
    • http://quinta.cl/upload/files/92904075856.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/wenorikefulopurapur.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b53e6798---damobasid.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/tq6smae1sh9efgd05gij4remq6/83888788705.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e5e81044cce99059b6e928862a2658be/71300509100.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160761f0a8953e---99387843130.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 10576 bytes
SHA-256: d43d4fa07e5c953b9d15f6e18f521b1f510463a245ea6488f98bc928235a143c
font_01_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 17524 bytes
SHA-256: 3eaf22e5898411965be1ceb7df98caa1f2dc0c3c52ac347c47a76edd9a796421
font_02_sfnt_off000164f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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