Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9fb379abbde626…

MALICIOUS

PDF

67.3 KB Created: 2021-09-30 21:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e7301d7c6d102499a0cbc50482565a88 SHA-1: 42288c27ea03bd16f6135f6fec1a82a799e8d216 SHA-256: dc9fb379abbde6268b8329a8c69c8bf99dcf36f7e76dc77c667aa10ec15e22d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's part of a link farm hosted on compromised or disposable domains, designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=dragon+ball+z+tap+battle+download+for+android PDF link annotation
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ab5c9gfj9h9bfpbabbhkq60uh4/jexadopokosuzaxan.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/61390086843.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelaja.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/52712132990.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/vavavugadori.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/77194727269.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/temakijibope.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155f052e026a---zagulowo.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/90013686929.pdfIn PDF document text
    • https://webrobogo.hu/kepek/24810475768.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109111619272278.pdfIn PDF document text
    • http://darstin.com/userfiles/files/85197125928.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/jelagaxibuluvudazirobawu.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/fajutoves.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210904045326.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/sukerewov.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/74941734995.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/q66r2pqa4ek1mss3feg4t662ft/3366164533.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/sosipupezapuwimalur.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/fijorepig.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/mumoxuta.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sename.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_off0000abf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC409 14048 bytes
SHA-256: 6b2aa0ee8d5c96e10fac153c622b25ecbe78afa0d427b5dbf46a9e7bc0395cd7
font_02_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 10792 bytes
SHA-256: 17202660901a65af7a374ea3a3e7f383017633e5c4847fb0e73f35e759e8fbf0

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