Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9c8931fc648992…

MALICIOUS

PDF

75.9 KB Created: 2021-06-09 21:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5b3be52d6ff5e32ce042481c38c496c8 SHA-1: debb4943568b997d3d09b0672433e757b8e63fe6 SHA-256: 8d9c8931fc648992d77e27a8805696eb1f4995f76110b0e49908a703346ea7d1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document exhibits multiple indicators of malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The presence of heuristics like 'SE_BROWSER_INSTALL_LURE' and 'SE_DOWNLOAD_BUTTON' strongly suggests a social engineering tactic to trick the user into downloading or installing something. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=remove+messenger+account+from+android', likely serve as part of this lure or point to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=remove+messenger+account+from+android PDF link annotation
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e87ad833---gixifipolufalop.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160862d1bc25d8---82961203076.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3249aa7273c744db010d2e0e29b55282/81163658302.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/susuzo.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f62d996133d99b25cc3d324436a34b15/zujuki.pdfIn PDF document text
    • https://bloomeng.com/uploads/vaduresesuw.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b061ae5f1a6---47055947274.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/49796609180.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905516a94cb---72202237793.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1f48936d---5820194627.pdfIn PDF document text
    • https://brs.jo/userfiles/files/39139982278.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1664d22392d80f0eafdc6d34d9408e46/gusilimejutow.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a6c1eedc8c9467ec6fc0a74a283079d1/defoxibi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42dd0e68d8ff76b64f3ae1d3f1123146/dozufazavozusojarixabujej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 5260 bytes
SHA-256: cb80fa3a3aeb7cefb47e5a9a3fca99f0f7a98cbb63a71bc7d6a3e86fed1ce448
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10904 bytes
SHA-256: 79f8ea2e30b4da46eda124fadf24ad185b2154d582eda5ec5c77035cc5c157b2
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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