Malicious PDF — malware analysis report

Static analysis result for SHA-256 694a5b5087aaca6d…

MALICIOUS

PDF

69.4 KB Created: 2021-05-27 08:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 980f058862f6e2dbb4cfdca59e88eb5a SHA-1: 44ee7156a94a5ca87a4b0d71986de71d9bb44c66 SHA-256: 694a5b5087aaca6d9db4bb0b341e19e49ccb3320902c1667a70f6c65bb280db7
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/1gamhcag8vkkae8mk0meru6duv/vanelopozogarulidotow.pdf
    • http://divorce-difficile.fr/userfiles/file/77428710845.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d57829f3c6bec54cb500a42be1a2d832/60067474019.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f9da93d6---mumositujomo.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f35ba63d---44879039518.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132b43749e---revojozubisus.pdf
    • https://clubelsendero.com/img_pag/file/70109354269.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841cca1d15b---zibururure.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/719a0ec9e7e3919de2a13eef92bdd0f6/xegugobutu.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/i3nrgmcasutlre9dao64tnkf8o/73928210616.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/21f4ed52775cb817c1feb545d0facaac/dirapitumidanoz.pdf
    • http://busanpc1.com/upload/fckeditor/file/37077223781.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44a07d28f---8992153382.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/89524d487cefa40c27f71f19560c34a3/90195046239.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4290203216---28926172212.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=purusha+suktam+tamil+pdf+download
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d2.bin
3c0052b93f91443fae954248a9c12a0536c044e874a1788091ca53262da06506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 5436 bytes
font_01_sfnt_off0000ec39.bin
007d3492b680a3872b4b7572e9baca4c12660d991ded73dfe306ee9eaa5cc6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 10448 bytes

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