Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9241364b3fb31b…

MALICIOUS

PDF

92.2 KB Created: 2021-07-18 02:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7327404e54f85386f36581b185e213e3 SHA-1: 6befc78d116f707b965f106bdefe6b2e54451397 SHA-256: db9241364b3fb31be56b153b12623ee9bb1c81b3c9626df2a8c28ea39931743f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728e3589644---dibolilo.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2ec90d89e5bb320c13b0a32aa1dd35fa/6730675747.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/xerifudikibum.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/17828753129.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160923171ca6b8---fuwuwadiveligata.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ghc5ahu9umu5adtn4k09m5b249/rarowapepejomareweminam.pdf
    • http://westernstudioservice.com/admin/userfiles/file/84009150488.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/56061920325.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gg44boohlcshj3k12r955ecop5/26601608934.pdf
    • http://kursadowicz.pl/Upload/file/40913787602.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a169f37bcb---damuxurirup.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2s4s069pnmvjtd6nkufaobe5k1/nokexazezef.pdf
    • https://detector-billetes.com/Imagenes/file/nogivetirubevagapokek.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb021a2c8---fetonekorusaxinidosobojik.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c6022f7eb---gegugebimiwof.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/74b63faf592867cbac9d4a9726f52ade/57157177114.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee0634ef3---wafuse.pdf
    • http://taxicityplus.ru/userfiles/file/89223691787.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/njmrsvt0qru0babi2e42tcnenn/nidobadipubozevosela.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/37028950437.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4f599c5fa219fc7dbdc0ddd652c31c66/gavisufidoxiwukudajoran.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/sukapifel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=these+happy+golden+years+pdf+free
    • 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_off0001067b.bin
c9a63d831550ba0a7f288a3e08c664570a891a64122033ccf69cccd38ca68c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 10664 bytes
font_01_sfnt_off00011eaf.bin
81c589b7af79ee1bf3c6293e0ba54e5a8856cb6891408eb83890b7619c9081f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 17200 bytes
font_02_sfnt_off00014b83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 16792 bytes