Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c56157ab5ad7c9…

MALICIOUS

PDF

78.2 KB Created: 2021-06-29 10:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 730861f678aa6c63a626d58397204b04 SHA-1: bebcd17156b1a0ef1d37fd994c271784fe198e53 SHA-256: b3c56157ab5ad7c9109ebd5af7ca265e970240e5d51f4e1730d9760485be24fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/0a84b1c0898eb8181d851084e1be19a3/21559805104.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8b1bc0b9d---39867860216.pdf
    • http://hy-concrete.ru/d/files/mepasezapetorijivaba.pdf
    • https://monyetmesum.com/contents//files/89627185059.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931a191aaff---44387255631.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984314e4325---mesanubedurerizasonu.pdf
    • http://mp-journal.com/media/file/13517203760.pdf
    • http://www.gesas.it/media/mailinglist/file/fadunogepapavewotumewunij.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/1314993660.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8809282d7---60741415396.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d6e13b72---88813506644.pdf
    • http://grimastone.ru/files/23820251878.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/acf8a9a0bd4fffcaa56d940ee6759319/jovefu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90d5b5be7b---dadugosin.pdf
    • http://edgecs.net/documents/67695853414.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/88f9d1d9f9ced94048d21a6efeb81c7a/93490172761.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ccdbeea0---15313239340.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505214439769964.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f532488cfa---62097863548.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d7097666---majopowepofolalazazuduro.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/83394d40ab2351825b69f8f0d6d7d4f8/54025813892.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96aeba31f---vaviredudapefede.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bully+kennels+in+new+mexico
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefd.bin
5f3c2e88f17274d98174a289d97107bffbc4381f993268424cff946078ce025f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 10580 bytes
font_01_sfnt_off0000e73a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 16792 bytes
font_02_sfnt_off0000ff4c.bin
dda43304d582628c2dd59e288aee5f54625d925ebcd84d2402a89989f248cfac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 16940 bytes