Malicious PDF — malware analysis report

Static analysis result for SHA-256 9237c672b0ae7360…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 19:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61031988a9911c691bbcfea461689c9d SHA-1: 23312111ac7faf814ed335b56c7d43a4640ea502 SHA-256: 9237c672b0ae7360227d45137732be9686ed02a9a92e181bad7640c4e7e4782c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest the primary function is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1f8409ea092fee7d5e45248931c899ed/67477482429.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160848d385f90b---digejujisiwuwesibugunevi.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/mokax.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/burirufusokotemasabivinez.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079a63e6002d---raxuzenilokeren.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/1415052217.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/potowuriguxiwapisife.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d3f06c31---volirugavesesunijok.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e3af73a525098bec126ae87b189b333b/91082564449.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/21658040680.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/pepixusapuleritodut.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/duvoxenisimum.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/300433284481.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kuwidaz.pdfIn PDF document text
    • https://puppometalli.eu/file/jaletez.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0060f5587568e3a38f039c3f538acd04/modinovigowikepotukokom.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/baac43d0b7f1d082736478554d9d3473/12896223993.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/lobigabidagejagulepuju.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fae17de3682---mimuwutolo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/zarizebamenisi.pdfIn PDF document text
    • https://nevisnews.com/userfiles/9224591715.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5418fe1e0a56d7d4d31e46942bfe40bc/78879792266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=old+testament+survey+1+pdfPDF link annotation
    • 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_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 18900 bytes
SHA-256: 7dd538abf734dd6bb8da35e890b8926b484b5a13b5d1ed01e61c84b0273ed942
font_01_sfnt_off000133d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEA 10804 bytes
SHA-256: 692db383c45669ec4ca557caee3b24557464596010f8b47b8805393a88307941

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