Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad039798fd68c6e…

MALICIOUS

PDF

78.1 KB Created: 2021-07-19 10:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f87c5e746b97282a3e2087b52029c66f SHA-1: 248cde284d49ed01b673324bcfe5e3355971ac46 SHA-256: 4ad039798fd68c6e61d52d57532d8f29ea937adddfdfb414ff42d04ec0ab145f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for SEO poisoning or to redirect users to malicious content. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/50bfed39b990a367d3c1a0ec843f2a46/zumofivasozux.pdf In PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/tatiremasudetisusuf.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/94692434232.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/791853293a92d766a6503fee007ba7f5/nalezufusa.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///21288774800.pdfIn PDF document text
    • http://liyangah.com/Upload/file/49684776534.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xakuwib.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/72534214940.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da41be9a8---80142405838.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/zadaxuworemoluw.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/mewubosefeturonopota.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cknjbg1mrk1uvvo1mg28bfckt5/52305783866.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510d090ff4---6764771259.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopewifakedumunaluzuma.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/favifegud.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/topodawura.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8g58ike6t5kevibha8nl9q7afi/60293553715.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/430f6ae228127547f1bc7ee4a8611326/10154749320.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/vidipagexofoxof.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/24233174439.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/071970f346c4c5fff48c86d2bf1d4c0f/73886079497.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/kilawivepamasapil.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ccngu52qpfa9uk193bvjif9h1l/wujodenelezurawavexaravav.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1udaaj0nftp95ckq699mh10261/bukoboto.pdfIn PDF document text
    • http://poorclarescork.ie/images/barajifatola.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c041af2fd00227051092c15dcf267fbf/59581179412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=common+strong+basesPDF 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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 16680 bytes
SHA-256: bd6fe16f1c95c00c4d42eca0dce2075bd1792b2f0e130fc1593c3367461f65ca
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 10484 bytes
SHA-256: de57329c754718d684e9323efd1d2989dbaae525fda15667f45beb7f908e4fcb

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