Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e1bf7310e13291…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 171cebde23d72d117167c6e534e0a9c4 SHA-1: fcaa5a64a53e450a103d1c1bd7dc395434940a1b SHA-256: c0e1bf7310e13291e283946bdd7099d3fe458d1b098b698aed874bef0255d414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the structure and URLs point to a common pattern of using compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://smidgel.ru/uplcv?utm_term=real+racing+3+additional+file+download PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0f89add9f3b03c900261111b3053c2e1/13573517794.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vu9f3t4upugf9ugpba8iptt56g/nixele.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/92067971673b770ee25fc76cedbf4ec7/22450460513.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817eb79ec5a---53908591892.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af04655b9---74898407433.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc133f446---wobitodose.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/94f5e8edcc187f7f04e2ee9a2caa3566/66239752579.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/39654055119.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cf4643a6---36809513879.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/91bba43b4ad9e7f00fb98d015aa554d5/jolinezedexor.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8ca0df47240f115c443ca1f441ebbdf0/semoxudibik.pdfIn PDF document text
    • https://red-adlay.com/upload/files/wawuvasuzazoporuz.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5c5e2ec6b146ebb3282f4a3b42570433/rajeje.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15376b6e6---91595401802.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ca66f99d94643903e4bd0677ee3c48a0/60896632824.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fb751f65cabf6084971404b8f9cc7f51/dizogasujatujevevojuduw.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e5s3ha1hoc4ob1lgomkmb4pgh3/fomovoberafadojixaka.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/59188736940.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/87546805664.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uqqsck49h9rvrne4c2he5cle2b/vowulal.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/s1pf9tedp8omksg3jbfujqcakk/nuzizorevijefazurojigot.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/jevomakemitazofog.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c518bb3d6---fokakiwavedabamumilime.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210608_10157755CFAF6018.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 17780 bytes
SHA-256: 8315da1d7c01026f2f4c64985bc065d2df54afcaf3635c892f5c87a976e7af90
font_01_sfnt_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 10784 bytes
SHA-256: a10dda26b9b13edca6cf460ed3946589b142c41d3769d2dc9d6a3ce2353df71c
font_02_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 16048 bytes
SHA-256: bfdd69aa30d96800530b77fe8cf8d9f2360c7435908f1fa82cfd92aa674e670b
font_03_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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