Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a570c902c429f3…

MALICIOUS

PDF

88.7 KB Created: 2021-07-13 19:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 626fb8ea675a83bcd57eb29f0b9a6853 SHA-1: bed531239c29c71422a796efd57ba1d81cc65d2c SHA-256: 91a570c902c429f340e94b4edac8b3f8bba09d43c38847c7ebe9ba8b9774d47a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pixomot.ru/uplcv?utm_term=general+knowledge+questions+with+answers+for+class+7 PDF link annotation
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/36f7d8c8915b8db67a52e38368bd98ad/nobamixizukewowadijenu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/692284985.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dvqgcug1253vfteb5h8mi04dns/93508105897.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5066d02b---vapadazigu.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/wixelisizinubozezenikafa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c655a9aa---31760907691.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ff82e02ed28a93540f9ccdad39f4c6d8/kuxipijeta.pdfIn PDF document text
    • http://groupkaishan.com/d/files/41541074245.pdfIn PDF document text
    • https://starbox.fr/img/files/98181701751.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/35189233573.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/50779284440.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d609e957---93001378428.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cb45293a3e33cd0a5775f6987d45b43a/57415609376.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/defub.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ef142d55013e18df708145d91181df6/57433317919.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02128065a---45610923048.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d4d7fvkb6p98cfstjcktp2lou6/momezogufulugozanijikowi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9bc4f5e3c5ae5de0cd5fff2ec68b2f4f/fatanonodekabezonesog.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/61946463311.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zigen.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/wetegaret.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/7130020670.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd367a5f8---75147672914.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/73554765012.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f7529ba195f32f83e6b35fdd5515132d/vokowizuze.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4977bf47b---44413229227.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_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 11268 bytes
SHA-256: 436621b6c471c7df27aa5c627df707dbc96ad598e319397229def0a383fc049c
font_02_sfnt_off00012601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12601 18024 bytes
SHA-256: 43c736d3d842ea4c29b6c4cd96b726e307cc56791fbc839ce3ad53744bb56b72

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