Malicious PDF — malware analysis report

Static analysis result for SHA-256 df982560d92c6ce4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 03:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f2eed3b2c8e2f82a8d2e91c97ed6324 SHA-1: a4f480c78ed2be86b82bf48f006c5e3f2e2fe41a SHA-256: df982560d92c6ce4e1af6e430967acd2038d6267a3b06d26b6378a42594ef45d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://geneticapanama.com/userfiles/file/16612036343.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7v753na0gmpf22hltutnaunm00/59060481555.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1a475b290994e730d355a495108a2af7/zuzobokukigixiluliwujoweg.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/91341188520.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109130155029319.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/paburaruviw.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/metodisomojewisupa.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8ski97hqsuvhoh08dgmpl6tfcr/58075899912.pdfIn PDF document text
    • http://comac-international.cz/userfiles/file/remomoberiserox.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/92683074628.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/nanuba.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/denenixesekilir.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/62172492458.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/54120083304.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/lulejevamefudidema.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613359ae63037---86334671103.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/74826219210.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/popitobivefolipojamazus.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nalawisiva.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc01d3fd---nebijo.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/29024358959.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2cfd173b213a6de45b9cd21988dd3c28/lisonidov.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/lulabopowogop.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/rawawemaxagiweso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=who+watch+my+instagram+profilePDF 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_off0000b1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F3 17456 bytes
SHA-256: dc7df63ccddcbd3c785b72b9643595f0ec4f73e9ed87a1fcf837ffb294ca1591
font_01_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 11120 bytes
SHA-256: f3064046b4634343c3a226b0ea33eec4aba47b1197ca7ff88f23abeb4ebe0423
font_02_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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