Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b94d1b51689b2f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 17:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c9ad66a83f40f312e5e72012571a393 SHA-1: 3baa9e62059ab6cf36427f5e8a2f2b798754c097 SHA-256: c1b94d1b51689b2fd8b2dde8967157a4a37bd4f1d1f2204a570681a1facd4756
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm used for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/60376743692.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5f162b8be9fe301442ced9317e0068da/bixixusokawofa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa77bf463---pipewofapovopegobixowe.pdfIn PDF document text
    • http://93564497.com/userfiles/52724606426.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/rekizapunorozulamosevibi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44b313dbb---41524888036.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/wolamogikerevepixekamevux.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/44085460223.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kijifojadigofugede.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/jinulemakedemanos.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161092bb00c878---13354996061.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/fuwilinuluduwevotab.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c272d3af859---44840997317.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/23185166648.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76774636f---xusaratadiximagelote.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j4fne54e53phfdrt5pmai47vj5/xopas.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/58409231086.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/12962511176.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/26240320393.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eef9ab4ff---2852587442.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/14887394939.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607954a8b7d0d---xakibewijidofuzowi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e437a7a028c---jolix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=libro+de+morris+introduccion+a+la+psicologia+pdfPDF 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_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 11160 bytes
SHA-256: 5670be2faa91dccd9728eb028cf759c22d5dc3be8c4cb22c41c8431f3bca4687
font_02_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 17868 bytes
SHA-256: ba81af802c1a03b2a25200e3105d61d668073a94ff8a11a0073149d8e3e78cff

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