Malicious PDF — malware analysis report

Static analysis result for SHA-256 d456b31163e37b79…

MALICIOUS

PDF

87.9 KB Created: 2021-07-28 10:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05a172164c3448e132ad818f4884d7ba SHA-1: d2d3f78870e8f8dee3ad698c91eddae0ac9f9629 SHA-256: d456b31163e37b7976660bd4cd15b7e124ecbec0f59efd2c36d0724b1971daf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious sites. The presence of multiple distinct hosts and link farms indicates a broad phishing or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://aqcons.vn/upload/files/31430873650.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a1f0dadbf60e27ba3f1b01fba538dba1/zofunorepeduzevojiterizu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aea30c7cf---96806614639.pdf
    • http://ifa-astrologie.de/userfiles/file/zepafovimivojadegimin.pdf
    • http://writtenmail.com/upload_images/file/56228995793.pdf
    • http://anhbanglaw.com/userfiles/file/sotagomujupofededupi.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/semofagos.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5993bac7ed0bd034fabcc08e65065a85/valobinofizi.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3da28607---8053194502.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2e18aa47---22832756476.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246ca151cf---33448010191.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe5d2ef94---mozinet.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/2aq0ma2bs59g7sdm7mvb15ptsi/beluvazasorafekeveluneva.pdf
    • http://ketoanaca.com/uploads/image/files/mufabugowofatasuwogujaxib.pdf
    • http://ddservice-bmw.pl/userfiles/file/wokupotixose.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b7db200d8ddd5ed1964577ae72493e29/63290676201.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ff213fb6---magidigiwamifora.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0d72bd96d2bad46718e0e27ee1dfbafa/jugixisuwosojaki.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8c73e975977b1a203caf4ed833a8b1f7/taforenawakufonewubojaxo.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/75965026378.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/norofagijodabipo.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/96135185572.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4b5cdc8f68799984dd02edacd34a68ef/falot.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8527c2f6137303deeb836116fd8a8ab5/rifagodewutawofedad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=abecedario+para+imprimir+letra+por+letra+may%C3%BAsculas+y+min%C3%BAsculas+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_off0000ed74.bin
db232d978ce926e2962b5e6a6f657404bab65b18265a07d3b086278b33bcaf1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 18256 bytes
font_01_sfnt_off00011c25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 16792 bytes
font_02_sfnt_off0001343c.bin
946f79036f68e1ffab756276f1cce03cf5b07efa8b4105262682c021cf2b624e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1343C 11232 bytes

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