Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eb91c6a7530abc…

MALICIOUS

PDF

88.0 KB Created: 2021-05-16 14:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0c5fa7ca48bbe5014ba264aa8e3acb78 SHA-1: 28193dffd615434e89c5a81c915e52ad75595e7c SHA-256: 25eb91c6a7530abc8c8a572c9c2e3a0f21031b166fa13e7ab16f0e4e2068a62b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of URLs like 'https://pixomot.ru/uplcv?utm_term=bitumen+emulsion+pdf' indicates a potential lure to phishing or malware download sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct malicious script execution was observed.

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://pixomot.ru/uplcv?utm_term=bitumen+emulsion+pdf PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b4c2cc7a15a010b87ca0c9adb4e6dbff/zepolapirupesudekovus.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/s1cnfd3jfjpff6ns4dtct7tsa6/bikoxi.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/dununukerid.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pumimemuguzefiresiwa.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/liwodalilezofisope.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c245c4bdd---48833601801.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671a7261c3---vezorozotojo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1250804648db8534f601ced755211e39/mulak.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e862fc1ab8b91053d162afb759a66c0b/71503839194.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f9fd9715---2045799727.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tugozonizameleg.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65140003c---jifit.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c42d66573b7a09cb3233d70f4b5f4f09/79998070322.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_off00011921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 4932 bytes
SHA-256: 0926539151131b2d265467bdaba6e4986bf4a3455e2c7c073fc7a0955294b6c4
font_01_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 12668 bytes
SHA-256: e3afc42f61748d133afd8ebd2135e93be6dd842f4aed446102715a906b38bcaf

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