Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ad915eb0e5effd…

MALICIOUS

PDF

72.4 KB Created: 2021-06-22 14:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b3142905c1b6ce4ca0c83b9592b6043 SHA-1: d045e7703fe002e74ea523e8e94609a564c02e95 SHA-256: a1ad915eb0e5effd025e50762fd7e10300e90e650a040946b3d9d21f8c7e9c18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs like 'https://smidgel.ru/uplcv?utm_term=download+windows+8+setup+64+bit' are designed to trick users into downloading potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://smidgel.ru/uplcv?utm_term=download+windows+8+setup+64+bit
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b26edfda2020e182a510a4ea78eb6950/pogawabafopokamixez.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/48c2498601c08750dee6fe68d545a062/78933526005.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160836c0eb5cdb---netomiremupowuz.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/f3r8la5mgip92itb88a174u2nc/terosejizor.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e043bbc1---dilopulivumirunolusakazus.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13ad790ec---siziwifalosesu.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6f0827ef9ac891e0389f83abc3773eb2/pixatibojijabexedapete.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/46120dedfad1e94d671ca1ab182844e1/15233556783.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160981523eb86f---3183555784.pdf
    • http://cezanart.com/userfiles/file/81406987810.pdf
    • https://cecprint.com/images/file/19393476356.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/ninuxebazoj.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4d4f0ead---vexaveradufedaboribux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcad.bin
55898a233b3abd2a741bd3af654fd90e3bfcd63d084e6853c9354842ead795f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 5524 bytes
font_01_sfnt_off0000efaa.bin
d0b116622703acfdcc9eee96d4718e062f56544a4adbc7b0bbf72bb5d225c943		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 11076 bytes

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