Malicious PDF — malware analysis report

Static analysis result for SHA-256 942b8d6867ca5cf8…

MALICIOUS

PDF

96.1 KB Created: 2021-09-16 08:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 414ca27eeef3427b6f5329b86f4ff5ec SHA-1: a5dc7c734f1b70946f14e3c6b254f2bf0b59763a SHA-256: 942b8d6867ca5cf8784778900a38196cab776fe11703f447424e5c13e50cedbe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm indicates an effort to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://alwaysshine.com/fileimage/file/fepuxunopipirasurez.pdf In PDF document text
    • https://totalsewa.com/userfiles/file/78100465947.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/52857549503.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e5a759f0---31178396062.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/savabesosulisikiwanegalax.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/17065701876.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210915172406.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ef2be0b7---49551213654.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131215781957---rorejalixotamifoxotiru.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/gagokebumolizifagufi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ab7dd82bd---wutonojuralisokuzi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/xumosidosaz.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/73180342610.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/70658341886.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/xupisim.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/jupoditubeladebebipeji.pdfIn PDF document text
    • http://laserinnsbruck.com/static/zabimetibazaketo.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/bipiraj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613914c5c0313---67913215373.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/484864978.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/rufusopezetegojufezinef.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/76709354366.pdfIn PDF document text
    • https://digireg.gr/upload/mupodix.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/80400368278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+fast+and+furious+9+on+123moviesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 11368 bytes
SHA-256: 490c843a756805957b9571eaaa06465a09c2afb6a4c909fdbdcc3678643a5b1d
font_01_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4C 19460 bytes
SHA-256: 421d9d26dcf1e28b6e8dcc95c333be93b94c62ff9727cd18050e55c07b4486c4

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