Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b906159485c741c…

MALICIOUS

PDF

69.6 KB Created: 2021-05-08 05:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b1b46adce49fa456b848459f4a123a5 SHA-1: e0cf694cc1e8daf078703ab35c7de23ae60628c3 SHA-256: 7b906159485c741c0e3c0ef480bcc8a8376035fde6a357c0a9d397f3d761f540
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tq4mnce81v18j9rsqd565e6cas/lonituvaloserinanuxenuv.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ab04d70f76e12bbf13b6c8aaf00c343/7895642783.pdf
    • http://monkey-do.net/userfiles/file/raduge.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/12348d96db1a66218bf95644ac4e8064/51693659143.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3682b28bd74217ddb040de6077aa3837/bevezilufedotinaxedex.pdf
    • http://amadpich.com/userfiles/file/poxabadomomamajo.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5e3e9e30---78713931534.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rjdmk5jrr36e897vgrao5lqb51/xajefideposuluxobazibo.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/147d673ad85e7fb157a43e4426abea0f/xurelunudewiwudabale.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160867e8db0de4---tetemefimepi.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0fe3165d---gixigowif.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a8e385bd---57489359824.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ppa9jkshaqerptkhscbd5ppt93/74073004927.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a61d7236---bumud.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef059b3959---198372531.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b86edb91e2---77129780097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vidmate+video+er+for+pc+apk
    • 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_off0000d44b.bin
36f19226f0780a32423fb57a3c116548fff8842fc56abb2940f6b73ee6c24fe0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 5180 bytes
font_01_sfnt_off0000e5e1.bin
23dc6b1b104078c0ea6b4401daec58b966ec3efa17bbef7fd1fce04908b9eadf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 10396 bytes