Malicious PDF — malware analysis report

Static analysis result for SHA-256 273fefbbf6f944d7…

MALICIOUS

PDF

75.5 KB Created: 2021-10-01 16:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b549060ef263ab46aa97a65679ad2468 SHA-1: 40ff84bdb733d912b0e120010771d7bb7442266f SHA-256: 273fefbbf6f944d77d86f4b99652ee60b833708586cab0baf950f6c8971c6d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

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 http://intertermo.nl/userfiles/file/farupapurajukogopafokaga.pdf In PDF document text
    • http://kahounova.cz/userfiles/file/15158097203.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fdc211fc2b5ec9105f7595209a4f32dc/80966846788.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2f10869e---lutegejolozugarepugisul.pdfIn PDF document text
    • http://simoncaulkin.com/images/22863008331.pdfIn PDF document text
    • http://elsped.hu/files/file/74590478184.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/94267433857.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8he4ap3iq43sq9qgr5scgp8lsv/raregunanagam.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/93300173340.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/zovibusijosub.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/gemuvovaxikuxikakuvako.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/dirilaja.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/xutisuzuvesurawib.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lejewalegamugixeles.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/18368468119.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/13737926324.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f57984f258---16692812153.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210929122008_c15zc3.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/30933132611.pdfIn PDF document text
    • http://htygroup.com/upload/files/fazufusisapexasodipuzofos.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wesesituwixila.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/repabumebeleruvesifutivu.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/datiwitatagi.pdfIn PDF document text
    • https://latework.cz/soubory/toput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bingo+calling+slangPDF 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_off0000c04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04D 19076 bytes
SHA-256: 0f66c059d865bf5a76d290be5ff98cddb96f9c14c9defc5c34aa551dc84f41f7
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 10128 bytes
SHA-256: bc8073990a244fcb1de90c445cb6bf1a03fe6d855446a6b9492bf4754fdf4121

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