Malicious PDF — malware analysis report

Static analysis result for SHA-256 4387150226a6c9b8…

MALICIOUS

PDF

152.7 KB Created: 2021-07-03 04:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c2935ee93a3dc35e7f3c4429cf74e0e SHA-1: 6b4062144fdc8b8834f8049d4ba7e0d05b352151 SHA-256: 4387150226a6c9b8283d8a35f79ec09ac878f32f76c029ba888db916324d6f32
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=nate+botched+by+nature PDF link annotation
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f6536277c9e4536587cc9cc21e4b6c0c/39571861666.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/84913975192.pdfIn PDF document text
    • https://t2sc.me/userfiles/wejevonefitenibekojiva.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8845f19e5e---kaxamosolinamesin.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g5mranlf8bocl34vegie13g6lp/sekuda.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/843763a38c0b2131961ab0f196df4a99/6129364889.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/vixipipiber.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/47974155384.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/mikimidofedatonokejowuz.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/939bb03bcf251f6741b796cfe43673fc/zofot.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/13891866432.pdfIn PDF document text
    • https://triosms.com/userfiles/file/welivamejaxopomusafajof.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/041ad784f47b70ffa6516e1059ef2dc2/zesaligigepukiripezawotuj.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e3101544c2f37c407fa18b8250c08933/dogatubiloxaduxugabazaja.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ov47ra3sqpsi3cght2irjf1q46/jokedejebuvaxepofaluwi.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/33126840671.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/68f70a4adc0eefa549b856e60e7dff76/xupokuwi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd4db324a4---10460939878.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wixorowutefi.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/19813543275.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/272bfbf0aacdec0194dbff65555cd53a/lomenam.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pbbj313erimts3543ilmsn728r/52955021756.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f1732392---gulunupufubupemi.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0001f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F702 17776 bytes
SHA-256: 710499cc53327938222e5390862b8f55bb0d574f39b35a420ceb762dc4aa44cf
font_01_sfnt_off00022585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22585 10492 bytes
SHA-256: 07d8227451b2c1643482e90216615d3633e28daa151ddfbc773a9a8a2afbcd05
font_02_sfnt_off00023d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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