Malicious PDF — malware analysis report

Static analysis result for SHA-256 664bf219960d5406…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 21:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a844c120c9b77a380106b7d2cf3c1a0e SHA-1: 80b2a54083cf0c05e14f53efd19cbb5589f9db06 SHA-256: 664bf219960d54060f133243f179fce74e4aad3238e43d42e6d3f0aa996e5025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The presence of these links suggests the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=dd+form+2860+used+for PDF link annotation
    • http://almar-bus.pl/userfiles/file/tabonivijigagesanilexojuv.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/rodogap.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/32242146436.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607637200d244---28352988493.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/52791339871.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v9n6m2h03cp2uig9rk63n94sgb/wobutotafarufejebizu.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/59544155134.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/61513183466.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84fd3195c---tawiketukiw.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741cd3af315---nosazup.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0316a08a31fd69892e98f85b1f5bb649/vevazigibopatuvivofoz.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/261624278161.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/99cb600d6083b157b57633e85119cafd/mamunodo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fd9d5c94e80ebc06181b4a5c2d12cf7a/wifesojekefabena.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/83598326787.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/gixube.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/wopolazonepuzelotu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f105633---feziralasuzutawokuputetal.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5bcb2bc77---52565055658.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1q8rnm3v89o20f8b4emo74lqap/wiwaku.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5352ff86---16827981415.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a821ded99d2---sokipamukabesarawo.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/23817439811.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tojumupomavasewezaj.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/25778002170.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_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 18168 bytes
SHA-256: 39fb574ec15c9141061a0aa346dbb6ddf2ab5b4f425cc9d0f4d62d04f64974af
font_01_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001311c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311C 10732 bytes
SHA-256: 1712d8ed7403af8e99668e4f09cb8a5e615ca9b1e8e64997b6b9ed2a55b94f74

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