Malicious PDF — malware analysis report

Static analysis result for SHA-256 861c67d0787d01dd…

MALICIOUS

PDF

75.1 KB Created: 2021-07-02 22:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 71c35cc3a69ecd642bb5ef37d5a79018 SHA-1: 2c521cd45b6194559b69b8f80322cd3e93ef8eed SHA-256: 861c67d0787d01dd4eabec61d1e5b2e27a33c5c6322fc9f99e54f482ad556a84
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=inappropriate+crossword+clue PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160920e24330f4---bogewe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47c66f26c0---68724568615.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8135eb7a96---donofiratavibitud.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/0f3ae94bcf41292ac87ea41877830e62/20762059999.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/bovegeduzojararozo.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/64036558341.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56bc75503---67884018267.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/45f7f48afe17403d7a8eaef5158c2bc7/53762297349.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210603_1130098F78EFF672.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/86884501013.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/57855790035.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9c65f1d6---befotuzexefizetepugowivi.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/10271097274.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/9d255a34b82c6eb2008a8c5e4fd98775/22018872392.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/76719169619.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gujokavagisupubamopisame.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/goxutolo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/496654a770136957b9e71b7e7d321c63/52265331952.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bae951f1315eae975ca19096568fd4b5/pejobaj.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7b53636799642c1f57a71765c0c16cb5/xojuraluminefamu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a782b3f5---76809878927.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2c1cf66d01a8294e6a0365a02d40733d/milijivibazuzoladapot.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/a5r8fpap6jrgg995k4s064r7it/tebolomokofive.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_off0000c2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 10644 bytes
SHA-256: b4a947b86cba6932638c0865ad3d2c7120caf2a579fc9d800d96dd0f57f3c377
font_02_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 16836 bytes
SHA-256: f56a7425870924959cedbf1a0cfe94bbc5fe432fa311cf5810034063d3efaf8b