Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60e28e35d53b61b…

MALICIOUS

PDF

76.1 KB Created: 2021-10-11 21:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4fa91e755c467f5b6da712d41e809db SHA-1: 654dc99c9201657f3ab9c39f3e7449164d99e331 SHA-256: e60e28e35d53b61b88bc5ac8a5f41c004b3aa0b036a60947370a0d450a6c1efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were extracted, the nature of the embedded links and the detection signatures indicate a phishing or malicious redirection attempt.

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://9262895.ru/ckfinder/userfiles/files/29508986317.pdf In PDF document text
    • https://wangwangcamp.com/uploads/files/202109170118048227.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/15567753112.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/96644313562.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c983f3c9dd4404f33896d74e3b4f7bc0/kikobebamudipuparug.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16138e07b10030---75198421763.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615923a316669---89029050573.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/rekixe.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615ca6aea2262---tapidu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a181007c---xobizorelusep.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/dapovu.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/72580535791.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/gonenomevilizukadivo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80255db38---genitapezuturopag.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/filitolajama.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/7122826467.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/73541731486.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bca4d77082d73b6f952747452ee80f73/jajamujezamarofaruwo.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/60659197452.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7052692374.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/risiwujarowofubunewovuru.pdfIn PDF document text
    • https://blokhol.com/upload/files/38966930556.pdfIn PDF document text
    • http://taigesw.com/upload/files/73999207811.pdfIn PDF document text
    • https://edusfera.pl/upload/file/73618763652.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=draping+for+apparel+design+helen+joseph+armstrong+pdfPDF 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_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 16788 bytes
SHA-256: a1218b5f6f5f6a2e862cfd8c2025e78c0b337d5661e46f3131dc8e6c12098b03
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 11076 bytes
SHA-256: c7e6696b272bd6ccf896da83e5fe57f0276e2c302a7ee7c053dfe92995eade99
font_02_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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