Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e4b4351321d228…

MALICIOUS

PDF

81.4 KB Created: 2021-06-26 23:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a39157c863fbc6e11836ee0d30030d1a SHA-1: db2d4788799f22768a767a49f37968696ef6726f SHA-256: c8e4b4351321d22838f8ccfea60b447705dc085c83f25bb881c576afb711092c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=labradors+for+sale+near+me
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9172d457---dajukin.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f315ced8---vuvamemulaputimewumusup.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5970089837bce5bde15e2d51b039eae5/15930659666.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/pgohm86hfplepjit04lttn2nn6/79106695084.pdf
    • https://nevisnews.com/userfiles/fepajibosuxutafa.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e6b0eb441---sipabadilexorupajikuras.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730197fbf6---26290032085.pdf
    • http://modnyi-buket.ru/uploads/files/80972933101.pdf
    • https://pristineleather.com/userfiles/file/bagatagapam.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b30d61bf3---58858430475.pdf
    • https://havanic.com/cache/fck_files/file/49786832743.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/67359668777.pdf
    • https://medsplus.us/admin/images/file/7773911114.pdf
    • http://massvt.sk/editor_uploads/system/files/najinufikerukipuf.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a614a0d58---53607899597.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797a1d35d02---40576890528.pdf
    • http://mousike.it/img_ins/files/93355739939.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088c77b662f6---borur.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d561f8a77ff---visubogavu.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ab3e8e12---zokixekujikarowamebusipug.pdf
    • http://adamlegal.com/userfiles/file/10442497682.pdf
    • https://xo-sound.ru/userfiles/file/tabidovaxowirev.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f9866f462b28982c4a5d7c5f33cb2db9/rodeni.pdf
    • 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_off0000dab2.bin
22a979bd5c39c29719b896e8606423f16a4c0bd43928adbc65f6cde905f90ee5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 10424 bytes
font_01_sfnt_off0000f245.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 16792 bytes
font_02_sfnt_off00010a57.bin
2d2e8cc6c1661467e45aba1bbaef439534a1cf41d7c9773b99758b6f230725dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 17148 bytes