Malicious PDF — malware analysis report

Static analysis result for SHA-256 474abcba0d4009a5…

MALICIOUS

PDF

114.2 KB Created: 2021-06-30 04:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4a073b8339ce686a67cd20c96d27d4d SHA-1: 0cc0fe0344c499fa5eb468e51df4da4789f2ed3a SHA-256: 474abcba0d4009a5914c94c1296e8ab44c304d32598a75fd8b2c21a981de645c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The document body is unreadable, but the presence of numerous links to potentially malicious content suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a50288fa10fd11928c7d292f34abd3bb/sejeka.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607687bfeaed7---11651649407.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160807c190af4c---bebugipobutudoje.pdf
    • http://anandtouristcorporation.com/uploads/13684947074.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a23037b23---kolulunelawesegomole.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4784a0f431---muxadutewi.pdf
    • http://sosnovgeo.ru/userfiles/file/lozineg.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab9aa0888---81860892235.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac97f6522a548f12ed488241d6f57acb/lisifafupajupadivaw.pdf
    • http://bscartridge.com/pic/ragejonitovowowiririgetas.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f83b15f---97097972005.pdf
    • http://rheumatology.institute/upload/content/file/tekaros.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3d30252febc23748c7050035a30e1dd1/24843111183.pdf
    • http://andlupa.com/userfiles/file/5855500352.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef9958350---60109086714.pdf
    • https://ancoraeducacion.com/images/wutedagediz.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901a4129d15---95819443134.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160760548a937a---1636322139.pdf
    • http://hoctienganh123.net/upload/files/55662056201.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5193e3ba87---tinesilufebirugurijifejaz.pdf
    • http://artdealer.vn/upload/fckimagesfile/a9493c90a829a0a0b11b1637cfaba430.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/9gkvaf0f8g46jljd3f4hhbgprc/30584843569.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mental+illness+hearing+voices
    • 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_off00015a63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A63 16792 bytes
font_01_sfnt_off0001727a.bin
14c08384f207210dcf13dad8204a40892213daf5b2e8b3f9c1adadb188877ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1727A 10568 bytes
font_02_sfnt_off00018a94.bin
7a373ff4506bd12de27acadac6645386ed09994cc3a10f96098e5dadd35f064b
pdf-font-stream PDF embedded font (sfnt) at offset 0x18A94 19072 bytes