Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf936b9749a5718e…

MALICIOUS

PDF

77.4 KB Created: 2021-06-10 21:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ae8045ff8de6099fe1f1afce6685e70 SHA-1: ef5ecb14f1dfbd99e43b4438fd4470450ed36081 SHA-256: bf936b9749a5718e831b8bf9473abbe9734f9ea4349c53302fd1a0177ae1f257
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as lures for phishing or malware distribution. The ML classifier output of 0.999837 strongly supports its malicious nature.

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://crewmak.ru/uplcv?utm_term=gay+massage+new+video PDF link annotation
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/3539c3815ea510d873b2eec89b165396/23396240008.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b84818c6b---vusisosuxovomu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a6ab13cb51bc58b9a000d092d09ba578/34411720151.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3603dd709948760cebaf047a452aaeb5/xukega.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nisasaxasoragovavofub.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/35816835907.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3e4d2b7531b628325c2b7455bb15a8a0/savemizeluroz.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210524125626.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/soduxosajenef.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/76775137041.pdfIn PDF document text
    • http://carszana.com/image/upload/File/kagapugurus.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc43185693---ninawepu.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/85950508761.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/lukuwinowifujetebenener.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6a93099b0ed1cefd536088de668da1f0/13199477511.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_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 5304 bytes
SHA-256: a1bac4eeaccf98dfde0eb8dc67287f794dbc4998b9bfdbcd783a343ba9403c0f
font_01_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 9932 bytes
SHA-256: 8b5ff9c42b8c0436e6d28012f05c9bd45ca59ae2cafe64e03cb482188b385dd3

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