Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8dd9c73751f5e9…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 21:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c40d27b041ab9ac25fcc90e26371cbc2 SHA-1: 9421cae8dc6f713fbe1c0d5bc4fe3f751b05662a SHA-256: 8a8dd9c73751f5e9ab993a4694503aef1bcb9dd33f610ccaf5a446335b46987d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload storage or disposable hosting. The 'SE_CALLBACK_LURE' heuristic indicates the document body likely contains a phone number intended for a scam, consistent with callback phishing or tech-support pretexts. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tidymoney.com/ckfinder/userfiles/files/nuwarowore.pdf In PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zuruba.pdfIn PDF document text
    • https://biodez.lt/i/File/xitavusoremijexotevo.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/vuvufifinutabewuzuzadaxu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1f9a39ce---31939733552.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/82681188778.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/1270962808.pdfIn PDF document text
    • https://quizai.com/uploads/files/moxolenegekarimasajex.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/64278221171.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/62986339843.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/71013013091.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/moradaxufuzovirujomumomo.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15353356223.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/40884819365.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gowebigoveled.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/75564768948.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a413c58c47806dec631119174ffeccc0/75812271694.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d3635cf85401a854f48d69a6898bc0fa/xonorefidi.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/20493957978.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/19847935176.pdfIn PDF document text
    • https://bunianco.com/other_files/File/53280362730.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/bulilugiruri.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/kevunuzixekofo.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/71417756596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614706034b734---26577937841.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/7559170876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+virtual+reality+games+for+androidPDF link annotation
    • 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_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 17972 bytes
SHA-256: ef6e055aea25939bc0ba02eb453755f6755d5ac844379a898975f02c8d123557
font_02_sfnt_off000131af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 11028 bytes
SHA-256: 4f7f52a9e66f8f44eb57b064c31962721328c7508406c59dc2779d157f44e2f7

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