Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3477b56df3051c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 13:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ec838eab8b023be99cfbcf56f1d1537 SHA-1: bb3da54caad1dff4d1c82a2342d6ddee570294e3 SHA-256: 5b3477b56df3051c1439ef92a5feaf82345b31801b0645df66e0c0e1ebd53804
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 disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a phishing or credential harvesting attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=fortinet+android+vpn+client PDF link annotation
    • http://liqaa-lb.com/files/userfiles/files/45014681302.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02c24ccea---23585620404.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/12530886046.pdfIn PDF document text
    • https://terracell.info/images/file/83018577540.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/2183697572.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/96003403226.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/4734193864.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dekovibareboni.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/90620942724.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/28025112318.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/10878548546.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f76d6558---53396933793.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/posusokevanomoravavo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b758f34e69---93496086832.pdfIn PDF document text
    • http://aven.su/userfiles/file/96394648507.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/93589208652.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/22119497823.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/65944635789.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/62992750374.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/rubalubajurosa.pdfIn PDF document text
    • https://zzwgjx.com/d/files/dowarogid.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/38440642932.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/riboxusuwagesuba.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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 16988 bytes
SHA-256: 408c225c1ff1e59d272b5a383a24411800a732646e85c305e1dc5698a86736d5
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 10380 bytes
SHA-256: 8d6c805821293afe0bc8d33bfed942cb201008b266c72e075f585de1beb59a59
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1