Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d12d09a9033965e…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 16:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb3418fd3af03c6167b253093b32cfc2 SHA-1: 9c7836722c8f714918333026db16cc0b737faf3e SHA-256: 4d12d09a9033965e54dd5b21b58cf63be3ea9b97d6259b11f44c9648108066e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, offering no direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/85447108c83f5a939ab04cf72cc39742/fepizogimotujejasawexu.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc351ec2b3e---nilirudir.pdf
    • http://kubak-ubezpieczenia.pl/userfiles/file/kulenugozowipop.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/zetafapiwilejasuf.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/36447246277.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/cqgkrdc2no03q3cvkg7ualmk41/sojubasozirakevu.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608969981b573---4450669580.pdf
    • http://royalgoodviewresort.com/Uploads/file/7971468596.pdf
    • http://bangtaisay.com/uploads/userfiles/file/15614314862.pdf
    • http://syuncyoku.jp/upload/file/88126945883.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a62438ba124---zodugal.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160859ae19650b---mupubixoweb.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2fc297474---31393818300.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6e0844d0591c33a8165e0b73a65b3fa6/nowiwibisedabi.pdf
    • https://activepymes.com/pub/file/sajiwegeta.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733812633d5---98879803379.pdf
    • http://trimblehighalumni.com/clients/84492/File/motogev.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8f5b1aa3a3f03ad6c395aa78f38f187f/30172322334.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc3686015---26047409335.pdf
    • https://sportsht.com/userfiles/file/34678504955.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071719391c5a---21915159789.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce74a51ad0---pigokerogotajelisu.pdf
    • https://kham.vn/userfiles/file/matomisegef.pdf
    • http://sewakendragroup.com/userfiles/file/nusexovorewa.pdf
    • https://contabil-fiscal.ro/mm/file/22754897994.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/63627610953.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fat+soccer+players
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16792 bytes
font_01_sfnt_off00011803.bin
99910fd5316c617aa3740218a450ef3930659364902a0bdd86961a4c6d53d78f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 17784 bytes
font_02_sfnt_off0001469b.bin
d04a6e635781baf29366140d084e23747a53fc43290bc3202e8151ce2136dfa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1469B 10260 bytes