Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc458074a14ca9d9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 15:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e333550b4101b63dff4065cf47c8108 SHA-1: a2018ca8a0e939faca6938b330ecba58818c1921 SHA-256: cc458074a14ca9d9a9dd13fa29379d466cd36aacc888a8353adfce5b3ab8634d
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and compromised CMS upload links further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=the+giver+answers+chapters+11+15 PDF link annotation
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160f466c1b2efd---22933765349.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a72164a748---dupupugu.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/10538789158.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/zokevo.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/48000506870.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/woziralegedawa.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090888f9c735---51455903535.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c9e4fa3410433c6fc0e72f940f4783d3/simomewevu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/52793298599.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/marubuzepu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612829e930f3d---gidalax.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/rutavudulexojojudedexo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdd458b602---81978595306.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/40948693560.pdfIn PDF document text
    • http://cga82.com/admin/File/bidujigixubezew.pdfIn PDF document text
    • https://kildevangen.dk/files/98076047863.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tuq1kgposfd8ka8rqb8k60fahh/bujugezoxujivaka.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b86fff2364cfffc6eacbd840a1d0d66e/satorefamoxilenejowad.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58e6d2a02---48892173522.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e91617f6---99142223821.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/55109039884.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf405d7171---wonulabotuxa.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/rudefuduwelas.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10788 bytes
SHA-256: 917901a2f54c31f311b57cb2fa3f287c6766e1b5ff06fe10145683a0be508988

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