Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f51f0fc063ae9e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 04:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c58f5bf5c5307045e243366d5817a06a SHA-1: 9c7ea7d3efa16bac93f6410fa55317fe506d15fb SHA-256: a6f51f0fc063ae9e323086ae25fca93dddfac5b75709bf69fc97e80b295241cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=how+to+see+if+someone+has+viewed+your+instagram+profile PDF link annotation
    • http://pdww.ru/ckfinder/userfiles/files/zafudemeworijobosi.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/padudigemitusuninabajuwe.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/68173983522.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161469434cd1d8---34329096468.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/58381230008.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/vesuvezovuxorosotaxoxam.pdfIn PDF document text
    • https://mkart.it/uploads/file/kovoxasulad.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ea106da0---13381152936.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/mumenemesev.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5bf6b73cb9280d9c511edc4c7c24906f/10404014994.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5b285b1a---zoduvajokebuxozujupofat.pdfIn PDF document text
    • https://sd-olimp.hr/files/82585214127.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/10754967801.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/betoleg.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/mekikenefabibikakobi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534a22d7da---76160443862.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/bobetananojof.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/defeli.pdfIn PDF document text
    • http://cga82.com/admin/File/logonagen.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/mobidabutufusov.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/39947156304.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/sifoforesug.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_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 11304 bytes
SHA-256: c85cdf96b2945a80f1e0ebdfe685c13371ec7b20b0a5f8092991361624d2f314
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 17224 bytes
SHA-256: ff0e194b38d36a6662982696320d83be4624ba162eed4f46357167ae2422df26
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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