Malicious PDF — malware analysis report

Static analysis result for SHA-256 3185b264c1d0e6b2…

MALICIOUS

PDF

96.8 KB Created: 2021-07-08 04:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0baa532f65b57706c30b3f71e801f494 SHA-1: 5a1ab93b397900a84476fb452186fbf60b23cefd SHA-256: 3185b264c1d0e6b2a40c26c6c07308efab097713dca2b43055fedc79f6273cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=personal+pizza+near+me PDF link annotation
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6db39e6aed18ac30e22598a0151d9bb3/51000244918.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/410c3f07aa8ac04d9c1901acd4298e39/ginalavebipire.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/el51575h0j5kvdbcaro8gmp1jf/dofunojitiw.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/62538569663.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f9b51fd6---46973633756.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbfb72e866---3704941365.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084230d2c7ae---67174361364.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/96348489389.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81cc4a2565084912c4eb909abe94824e/88331801553.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/wemufa.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83e4a1be02---38005138808.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9773feb1db---pugikakozadoximotu.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/33713816316.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16099add6ae0a9---jezijemone.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/makamege.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0bd20c722a75de6ec1ae10cc21fefaf0/runugilajoj.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/roverugeva.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/0cdc81a5d6a10431c908673baf1e9ef9/lefojikopat.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/71601413153.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/44199280160.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25890ef2d9---pimegoxexigefok.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb5b8046e0---42696996814.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/71239946615.pdfIn PDF document text
    • https://advik.net/userfiles/file/57034634030.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/kogulatolafimup.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/wubojukofoxukizunisitute.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81aa6cfdb---61008824715.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_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 10376 bytes
SHA-256: 194ff9bcdeb784de1d79f4cc8797b492af284677510d86584c62904a8bc94af7
font_01_sfnt_off00012eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 17900 bytes
SHA-256: b4e8502b4053820aefda46aa347d0fa435a6b3e49e5a08315bc1af83de55e7d4
font_02_sfnt_off00015dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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