Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f626d86d264e3dc…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 00:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc64583f8d1b0b93114b649cf1c15e7e SHA-1: 90d959e1e22e547bc97d888431b18fe68cc78e72 SHA-256: 3f626d86d264e3dcb7e2c4fb53afa259d9cf4dfd1af65f957ceb2ee85797971a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marcuspietrek.de/MARCUS/files/file/90685074892.pdf In PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/b389eee1e359a2cc70d6fff6a71c43db/26848412222.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/funidemu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/29650347568.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/nuvudilovunebuwuxudolex.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/funetu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9f2dac94865f475606ee5995125d1053/62558975523.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bamibaneb.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fokikufujatitiruporub.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c49787e2a---pezijewojezekukejudilemek.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b17090ae75b---50558910089.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/o6afg7ag7ff5htl3g82gms23hf/19335636437.pdfIn PDF document text
    • http://leton.pl/userfiles/file/ladirumap.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/fewexazekeku.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/95155756726.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/vujodebolojogaxutasirare.pdfIn PDF document text
    • http://planetamama.ru/files/file/91261295680.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-20/20210620151023909885.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/02ff8cc2b1c8a35dfa4a4993208804b7/98681375223.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d04c47ea3---51751206043.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/majufimudosejidovevux.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c96649d2---81676970651.pdfIn PDF document text
    • https://armenia4d.com/contents/files/23843999055.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0173mr3cpgoh0gfvfe22co2d91/42676182785.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/remidowexerejelubizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+to+word+converter+free+arabicPDF 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_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 17400 bytes
SHA-256: 6818c0807b8e16928eb82b0b5d23976a466300e66867f5013feee81abeafdfa0
font_02_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 10548 bytes
SHA-256: 64b77a5dbaf783d2bf1a0369dfa9d2ea3a1c122c483d524cbf6909c22932f317