Malicious PDF — malware analysis report

Static analysis result for SHA-256 902d5997d8d23df6…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 21:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b21948ff9168f6770c51f90492061b30 SHA-1: 0dbb70208974a9fcaf231230a17b32761c33abec SHA-256: 902d5997d8d23df6ebeda0f806a45548d9d0ef39e2a535d989b4e0abc5f1d4a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b325e122f---gabipigufanotixupegu.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/4gdb7q034b0uia6vi6pi149el7/banuw.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f0839d8dac63ac66a69a395c5877482a/vaduzovagemebizit.pdf
    • http://ascensionchina.com/userfiles/file/77719822005.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c801c71323---kawomiti.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/50c5cd656a126ab107db06ab35622f38/nizubibilelaziloso.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/57235332962.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6ba178788e6b5893c3cd4b280a99a831/21384827945.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe99591ad---57894564276.pdf
    • https://girilawfirm.com/content_files/files/76394385576.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/dikaberazosema.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd16e760c---zofejerosulapuzez.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e792e0bb6---4330150496.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb1f4b45b---larunaw.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd0e3d9c1---51566856247.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/gujoxezagorivinasosisus.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d485da32f---pakamedujibejilit.pdf
    • http://slanfusa.org/clients/47225/File/38565223227.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/qs2ij38684olr986033h3r21b1/53916835381.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5e3134f7a250642f0881ac45f2f73f62/73874884429.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fa2170c59---9406609805.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1msjp2d87h5kviopiuten20g40/dalurovosonigasizazoxa.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qqjumcm71uu5j8d667dgcc8lke/31494079370.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33030638a---tilebisaseg.pdf
    • http://ibtaker.ps/userfiles/file/guzogajiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=french+words+for+kids
    • 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_off0000ee64.bin
a8d214ce7954aa3c7fb667d57e65507bab234f1a0c61faa448267094eb7be51f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 18464 bytes
font_01_sfnt_off00011cd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 16792 bytes
font_02_sfnt_off000134e7.bin
310bcbec195fb93f2f1554010a2afb5a8ad6dcef05b26249f2ba5696486bf0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 10420 bytes