Malicious PDF — malware analysis report

Static analysis result for SHA-256 e104a72d31a32b7e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c891f4a308c9d7c1d6d5cf03c301106 SHA-1: 5e47debca1381c176e0975ff44e60fa231cff202 SHA-256: e104a72d31a32b7e2441eea3d44d92ba405443514e2eea3e83ca6472fc098a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, which are likely used to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=leonie+manual+recliner+at+joss+%26+main PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa16cf00a7---62581649683.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/okpri86pri003pbnubo06bet37/semituvof.pdfIn PDF document text
    • http://land89.com/ckupload/files/29169800018.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e9c919d9---begob.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc0d1d554c---woxiforigefuluxegejigaz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca87ed77ed---80379778546.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2c16af16333c06d03a8a38329509f39a/tabalepulivipem.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0dae26ae21d99c5bc3674c8cbca6fc58/49288611372.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/035a48b905bd65d7cfa67ff93f97b3a5/jamasesowomobiz.pdfIn PDF document text
    • http://fittbikese.hu/files/file/komosupejori.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6kjcpsqc719ntes271dpe6mdlb/18837251712.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/m6bl4qoggr1qb6n0vcmgvtuc13/fedavinekafoxukija.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/86601351557.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/sewoxulalijorovuvurazam.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22dfbdcfc0---9582583496.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/jisibelozifatumubasu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/43016fec36c8c72962c000cfa6876b64/12573644365.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3d8cad44dbec33431a663429c0c45148/69540188523.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/64514102277.pdfIn PDF document text
    • https://sadex.pl/fck/file/13885218070.pdfIn PDF document text
    • http://crediramasrl.it/public/file/31008821897.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abda2bb56---kapuxinid.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/85435655091.pdfIn PDF document text
    • 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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10580 bytes
SHA-256: 182b5ba5fbccc738eb7ac1e609f4bb5ad662444462ddf7038e69338e82375e1e
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 18548 bytes
SHA-256: 98e89793b55ebffe034f5ea3e30e55ce320bfe464a6405f26cc7ad9d9ac18f4d

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