Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a36f4eccd5ac1e…

MALICIOUS

PDF

77.7 KB Created: 2021-06-11 14:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 78357735db8c7a98dd71da825a3ec219 SHA-1: 4decfb44c54c63ad9240697aee83569518bc4a23 SHA-256: 37a36f4eccd5ac1e823a67a74eb60120062a57e937c66847dbb73a048065f185
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites, a common tactic for initial compromise via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=cuento+de+las+reliquias+de+la+muerte+escrito PDF link annotation
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/18dfda2ba36ce64e7e55dc54bfa80ac3/7030204136.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/39613960110.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/d26a1bspbn1te5m1iiv4046kdp/49838734313.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2bc795f788439fc18f2461b98514cba8/mobefebipow.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/57669455225.pdfIn PDF document text
    • http://sooclose.eu/upload/File/51167046586.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/be75f47ff6f0841a9a7c384f7b2eb02b/34710045670.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ma8qjpf7emf4daobtsvn4hbjh1/vovevuduxunapuzisobumora.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085fab51f4bd---rutelemafesebosalesorase.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/gesepuzisetar.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/50016056302.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c74e9d5a---xemafu.pdfIn PDF document text
    • http://hrudolf.com/userfiles/57027755517.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/45135416328.pdfIn PDF document text
    • http://millecolori.it/images/file/sitebokapupulakodideji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 5116 bytes
SHA-256: eb273e46df6a0f39bd1c0e36e7a39a2385abc212c83d0d36ae90cc0a4244635c
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 11064 bytes
SHA-256: 5b4ba05386c23fed23177d0c08e40d67b78c68f722a263919f5a3237f1009410

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