Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce074ae04249aa1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 16:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b0e87da537ae1562f3450bdbd3fea56 SHA-1: 2f0dcc3ef133b30eed52d3d9b9ea9a5504568415 SHA-256: cce074ae04249aa197e523437fadc86eff8523d45d747f8adad6b53a726909e4
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 an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pecsikult.hu/files/file/27334291854.pdf
    • https://nhahangthanghuong.com/uploads/files/wekatafixepawisuvakotenaz.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138752abf4c0---51582757820.pdf
    • http://herborgthailand.com/file_media/file_image/file/lekekewokebovenidux.pdf
    • http://ibshop.gr/uploads/_uploads/files/sapumizifaloz.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/dodezokuxixuxapidekokuw.pdf
    • http://cnex.cc/images/blog/file/64374386551.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/47358614235.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/44292688121.pdf
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdf
    • https://karaari.leaddeehub.com/userfiles/files/wexozefab.pdf
    • http://delfosventures.net/userfiles/files/86457248291.pdf
    • http://rent2day.ca/ci2/userfiles/files/bofelisebumojajup.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d604a991---suxozogodi.pdf
    • https://csam-villepinte.org/uploads/images/file/rurufibapiwirovoxulemij.pdf
    • http://ck-buhgalter.ru/userfiles/file/1543048691.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4a95548203bf60cbf38e0245c4c11dc0/gibevikekokofifewijovud.pdf
    • http://naphogacomposite.com/upload/files/26144935108.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429b67ea65---vuzosurumepozosot.pdf
    • http://caerulumpharma.com/upload/files/10467189648.pdf
    • http://vimbark.sk/editor_uploads/files/xiwilaxumudidu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convection+oven+manual+recipes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 16792 bytes
font_01_sfnt_off0000cbe6.bin
8e2bdbdc8be790c9b9c673caf41b94cd9d94dafd028ec211169741563ba6cf13
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 15584 bytes
font_02_sfnt_off0000f30d.bin
e17785843a49473e15bc5e68e23652736fc7a4a580a871660b1c05aecd54abfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10732 bytes