Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f46abb460e88bb…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 22:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8bc49a4d76aad8081602555ec769132 SHA-1: da64c6ee7eb00ad27f7beba9ff26814f1287a034 SHA-256: 84f46abb460e88bb1f7182a8f0d45735749ffdec29cca77d40afa991971f69d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=cloud-hidden+whereabouts+unknown+a+mountain+journal+pdf PDF link annotation
    • http://big-blue-bus.com/pics/fotos/1/file/44933975556.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/fizeroz.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/77565046723.pdfIn PDF document text
    • http://slsnn.ru/content/file/zobepeteboza.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/cc52eb1a4d06f25e775271806ee8f9e7/85108561003.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/65268559168.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/82968362d521b4c97397c80542995bca/61023116354.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/94250140637.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dac0dnkpk77eipq2439gitt11o/zesapusibuveze.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/semab.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gokofa.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/tokepowa.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb33e56a153---lubejepisuradupu.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/78922747763.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1aacd4523d61fa525cbb056cc01854d8/vapezodo.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/80288972430.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/kenesajeturomoki.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/21622246733.pdfIn PDF document text
    • http://fittbike.hu/files/file/35042625250.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e78460049e4553eeb2b0d11bfa3d2b98/44572972364.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D4A9C28A205.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a5494ad6---45706992632.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ca4e92563fb310a1798c06bb7e962b31/16617392360.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 16820 bytes
SHA-256: bc1d573f361db6c255af20911906b91c13790d41bb6b0913ad53513b8d1317d0
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 11376 bytes
SHA-256: 8c5b191b8768d2ead561057cca4c6ce13c57b5e0f02c1ceaeebe3c35d69f2ec8

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