Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc5b25c9af627f3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 22:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7707aadfa14c80c241381439f2a8bfdd SHA-1: 7f969f3bb2208e7d1983cfb4bf6613bc78aed7a9 SHA-256: 8cc5b25c9af627f32c4a45fbb11490df2c4abd9b002fa05bc79e480d4ef0b31f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded URLs, such as http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610732ea6be1e---pobotaroref.pdf, are likely used to host or redirect to malicious content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610732ea6be1e---pobotaroref.pdf In PDF document text
    • https://flyingfish-stay.com/userfiles/file/91922053841.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/83352909579.pdfIn PDF document text
    • http://df-foundry.net/d/files/wiretaboxatuzawolore.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/lefuzi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h1iub9ktvvu6f0hfcm3rfhp8d5/14321231817.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/66312083789.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/84697513542.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8aefccbad---vonikuxewefevelanufiwevor.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae672c016---pegawi.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/12618879266.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad53afbc5---80090823905.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/10067827604.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128e2a764dfa---75083088639.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160822d0dea90e---xesumeme.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/3163189867.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/80482562672.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/40561844567.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210723_100102.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e68b70a5---36519426938.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/49874100448.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/q0vs0t5ec9vnrfhe2en4futbev/pazonewatozanilajenatibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=engenharia+de+software+grade+curricular+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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 11068 bytes
SHA-256: 6ce50a8850dbb45e083aa68d72cd369d3b468188e20746d3dd6973c713c4a6ff
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 19572 bytes
SHA-256: 9bc9966388741d9bd1b211081d9247810cf94812814c44050f0d1c1eddfc85f2

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