Malicious PDF — malware analysis report

Static analysis result for SHA-256 842c6f7369fae4c7…

MALICIOUS

PDF

77.7 KB Created: 2021-07-27 01:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e034cf70399affaf61b2a58201593261 SHA-1: b3f4725c196ccaec6d417091bbed0504cc54120b SHA-256: 842c6f7369fae4c7822a16c7437d5fcd1adda1a181eccbf65bce683a58d699a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation or tracking. While no scripts were explicitly extracted, the nature of link farms and the ML/ClamAV detections suggest it may exploit vulnerabilities or lead to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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://actorconseil.com/files/file/femetas.pdf In PDF document text
    • http://barcabianca.eu/upload/file/fikalikezabonopomov.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b8126873c6a730997f1a875f9b03192d/5215283921.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c4367f201a525254e8177f558da14955/79556711101.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/76444401414.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gm315kqjqv2l4fer4o28jhem43/xoluzudagapiwokagofogolu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e888f25d5f---buxax.pdfIn PDF document text
    • https://actor-conseil.com/files/file/rijakafuwomofut.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ec6e750a---vafonesafesejakumorej.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/kojifuxolovefoposivafonu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8e0492ad---kajosiwisudutabopesowoza.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb59996e690---dojotavasufipufuwemugo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/aff93289cd7ca30ded4fae2601284e91/89839237649.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/56133dc1c2dbc67d5a18e7ff2e0eed10/51554658821.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/silasu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mixuwuf.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a7a5d0348fd733970420edab55b388b9/75051218184.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/2727040533.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa714887ad---telunow.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/imv345fc3flgkeehh4g06dsq75/93176966592.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/xizilukugatana.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/52578414839.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/kojusam.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/093ac75667da1376cb72dceb12155d26/xilitugakodaxunogu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/op1hraui9p6hpkeod04juteuej/59208183872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kamyab+jawan+program+application+form+pdfPDF 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_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 11124 bytes
SHA-256: 8b3275efe18ff5d403728696860b8ae39196f18ceffe4d72d1f443d5f115fed0
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 16368 bytes
SHA-256: b4ebc18c7951943927b97e3297ec71959ec082ada7d5e6af042f0e7ea08629bd
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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