Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3c741b7ebcf559…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 10:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7331f68d0bc46f3e3537a0174b4f981c SHA-1: a9517aac4083b171b80303a00200872e7f40e1cb SHA-256: dc3c741b7ebcf5591c5c1d31d27dd9804658f651d4bc27265279a7ba9a0b79d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised CMS upload directories. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614719818ad80---61528512451.pdf
    • http://ilkconstruction.com/Images/Media/files/kuduvufonagejifawapil.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/kuzekefa.pdf
    • https://altaitur.com/ckfinder/userfiles/files/pinemuvavubidumogom.pdf
    • https://quangcaowebsite.xemlaco.com/uploads/files/32984197502.pdf
    • http://diennuocdanang.com/uploads/image/files/padudipalaf.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/383c2f2d9742c3f19737e463593314ff/74218571771.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9e30f5980a2711205ceb1f4a2deef388/basirudofarid.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/45811841911.pdf
    • http://fialki.su/33662444482.pdf
    • http://jongauger.com/ckfinder/userfiles/files/50518143971.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3841a5d8c---kogopoxoromarolop.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/vaxibavonomewil.pdf
    • http://giasudaihocsupham.com/Images_upload/files/55124719440.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa02eda029---vopamomup.pdf
    • http://vandientuchinhhang.com/upload/files/57173418957.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/jtndkpg4361u7plr274dm9eqrf/49419074486.pdf
    • http://www.saletime.gr/admin/fckfiles/file/81116936728.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/neluk.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/14035748609.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/713012938.pdf
    • http://ymmicro.com/files/files/xuvogesemewilino.pdf
    • http://carsonpokebar.com/uploads/files/punalojemuzesezunejitunox.pdf
    • https://lemonsport.sk/upload/file/84980693169.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=world+of+cyberpunk+pdf
    • 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_off0000b0b2.bin
1610215912cabd6e42fa8d93b536a2e321c3b4bee9a9bd3fe31932f3be625727
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 14876 bytes
font_01_sfnt_off0000d5de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 16792 bytes
font_02_sfnt_off0000edf5.bin
476fb29b6fd4e5ea3d636d41eb74e60d6625270007aadd74b625a93225f6eb2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10532 bytes