Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf10b619f97a7d2…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89ba53ce124f4e9dae756be1b2df9fba SHA-1: c25a9a2b7ec236d21b9339c4c8787f68b79c9a66 SHA-256: 6cf10b619f97a7d21a4e5b336fa780c40249c8d1548a4abde4f9951203f52458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=pitbull+cross+puppies+for+sale PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6176cf2de---rimubuvizoviva.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/37605497730.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b451c0a4a3e---28712321810.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d914c531ba1---88304448879.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/tawogunifi.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/43070606578.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa97a8128---81240392785.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edb59dd52---vijel.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3caf377e81ae3e8fe735f29eadd89713/bowomijuwunewuvoxu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/pivovis.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b7f2da36---jatonozotosonowuworupib.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/bijuwomejaledozuv.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/22314416896.pdfIn PDF document text
    • http://24cvety.ru/upload/files/xalaboro.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42da653a1---24880275282.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/lologujadepazikijavin.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/lotapowadatikezusizademu.pdfIn PDF document text
    • https://datajournonepal.org/files/50492961838.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/kojulogakolel.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3ef670ee5---mizegabazekuluzosa.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160903db8ee95b---78091508123.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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 10612 bytes
SHA-256: 717a08bbdade6dd4fb03b45ed17f58972d2fbf4e2ab3f3b7edb8a26874477002
font_02_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 18384 bytes
SHA-256: 4d60ea1657c6d09577fd661062a99d2d88dc4c7ea34a9e7d77ac57af207bc7ca

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