Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a240c354168bf58…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad0b93161688fc50800ff4504be4921d SHA-1: 36ecd0e2199bfdf8ca7e2bef1d148b77f43eecfe SHA-256: 3a240c354168bf581a039e268fdfa7f9995d6a3f6fd33a6abcfdef8262e5e7a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082aaf455850---34657265961.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19fe218e43---salipipufemesulesoz.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/af221588a0504153579d70a3e8c34b8c/godolovowixurukexanakaguk.pdf
    • https://alihuata.com/userfiles/file/25813933649.pdf
    • https://designclarf.it/file/41734910202.pdf
    • http://ciarajewellery.com/editor_upload/file/nulumetefokejujuvuwofeluv.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71917ae0ff---70352175031.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799628f0a0c---78039468452.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cpr524cekf1flqphegumqja2cn/5820159410.pdf
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/raruxokefoganofewupu.pdf
    • http://allnatureint.com/userfiles/file/tubutubaxijune.pdf
    • http://taiwanglassgroup.cn/userfiles/file/batatumuwigirorimabaw.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec0a20b76---10812789518.pdf
    • http://goteneplast.se/files/images/file/pezifelirefukugikuz.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c710c4e7cba---73503631297.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607242658d2b6---rurorelavele.pdf
    • http://funperm.ru/content/file/tobuv.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a87824b3c2---niriwejimanivogezotikime.pdf
    • https://advance-pack.com/editor_upload/file/zuxulivixidojufaza.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6d2ce4a1---11193452036.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709521482ee---72616668000.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/15383019470.pdf
    • http://amctop.com/board_data/editor_img/file/202105200554.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gbmo4lsanght0d8bimbitcnknu/812045646.pdf
    • http://lamelove-zakryti.cz/userfiles/file/doxisigozogefebegaxabu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=motivational+stories+for+students+to+work+hard
    • 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_off0000f41f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 16792 bytes
font_01_sfnt_off00010c36.bin
204cfe5dd3153bd39cbf3d2e0f1b8054d2ee8cc802dc80e2257c0e92dd26489c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10788 bytes
font_02_sfnt_off00012519.bin
819bdba8448659bbae27daccffbd6756f80e4a157cd9e1b98c2e1e6cf821e2cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16676 bytes