Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1dad9f4e5d2220…

MALICIOUS

PDF

88.3 KB Created: 2021-07-06 15:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc76bf9e55e261a4f34ef15e448c9c2 SHA-1: 0aecebbc41599b831290a4d631c5e90453aca6d4 SHA-256: df1dad9f4e5d2220bf972d1dfc5105e769e19a433fb36150c01f8b08c515e9a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or further stages of an attack. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kotolantopeni.cz/file/34069790093.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/pikoja.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c9e2f10ee6872d5d0cd679a176be2a45/20083235953.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/xenovikiliwesalelofagimig.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a57vqn0u6ehqp0tm7qfmkfp15/18399973054.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8f248245---bulekeliwupefojarizuvipaf.pdf
    • http://pogservice.ru/userfiles/file/23708597435.pdf
    • https://smobiil.eu/userfiles/files/26731012496.pdf
    • https://lescourailleurs.com/upload/editor/file/72728728757.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92d3d876b---levafemofekegifugazejaku.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7d6b24a1b2d0fa27502d53518cac8c9a/30824822259.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1510b36ce---zegoba.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5b3ad8e7eb50a83e1da4ceb47dc8eaac/58304558610.pdf
    • http://chi-kara.net/userfiles/file/20389911476.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/53419163405.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sr0r74n1cvvspoth839602js8u/4948934518.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765eb43662---werowidujip.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/uc4odqrcn9d3lo94o9mtgu4vd1/10669182923.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d3cf326ab4605f2fd211b2e8af7e9493/kuvivasefip.pdf
    • http://kozelskadm.ru/files/uploads/files/25257292517.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bb85d6407---80958590987.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/uu9hnfho76ok7600cd5uc0v69e/dirirokusasu.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092beaeedc43---81575872948.pdf
    • http://www.jindatunnel.com/up_files/file/difekude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=all+creatures+great+and+small+city+slicker
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 16792 bytes
font_01_sfnt_off00010aba.bin
4d1be56bc50fca426fc12fbbc74a250dc5edff7022d60b394de13cd5383ff43f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 17616 bytes
font_02_sfnt_off00013915.bin
989c91a26f0c3ee4cc4ed3950c69e9f77d1a134d86f2999d8da9cfd80ab8b83e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 10880 bytes