Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf69f96ad5e6f2e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-18 03:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 173477af00cfbd0fb91b8c33ad30d9fc SHA-1: 9fa5272a6bdde44c3a9a0f4d7496b704e79355b1 SHA-256: 3cf69f96ad5e6f2e6c34def6f0cf63083d4dbdf3a6710642cfdcc15abd266c85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download server. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • 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 http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/obu2an46idkfm7p1ihro0mscg6/60053191706.pdf
    • https://anmimar.com/royal/userfiles/file/tebedakap.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/jotaguwemidozex.pdf
    • http://amexeuro.com/an3_Uploads/file/48931148405.pdf
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/81633648636.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ugpj0l0ej7qqau7i6bnh2kk923/tanaxulijematijomomivu.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9a253612---49431173211.pdf
    • http://csc-0898.com/userfiles/file/20210703061607_ycuvjn.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fac7e9a91ae4a4359e59e6d68d33a108/lujalakiweziw.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/37d0f23bd96b3fb3fe4b03d9a4dcad6b/95958488511.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/dalubisebimutemabi.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/a25565fda997033eaa8f6081d9e9dcaf/99265805854.pdf
    • http://mnogonomerov.ru/uploads/file/mizadetelomajapixosi.pdf
    • https://hoakhanh.vn/uploads/image/files/12179503043.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375fb3d91---96415307762.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3npf8v7aog0mjipob54kaq3pm3/65867703751.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/lum171f9kggk98m43i5f7eokra/63126302456.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5cb2d757d19a06869844b158f58300ef/japepojizatinekeme.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431680bc92---digolemifoteposenuzewu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a57a22b---delufituf.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/rilewimododu.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/bb5048ee6fa21b4e1bc9dee58439c8a2/23086068565.pdf
    • http://asja-doll.ru/userfiles/file/dixukasigaxajutazama.pdf
    • http://renovator.cz/files/file/menagiropirakigaw.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608110f40ab77---94735970989.pdf
    • http://airelimpio.mx/img/editor/file/42134844533.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=acca+previous+question+papers
    • 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_off0000f29a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
font_01_sfnt_off00010ab1.bin
09d97aac4350edadda457dbeddbf6d38e8643dd3b54e10f3436390bc03f9e2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 10616 bytes
font_02_sfnt_off0001232a.bin
2e1e851e27bb62079cc45a45f975990e296661f652a32838a91014e4af663ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 16704 bytes