Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9b6158571d83e0…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 17:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b673aa21e95936dc8f95c956aa3860b SHA-1: aadd2872884b4e4eee0021a52ce0ba94b5eee8fd SHA-256: 4e9b6158571d83e0884a903ec4f19542074384f191a498a3afe62bec82505447
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=breakneck+bypass+trail
    • https://mariellatriolo.it/public/file/vefasuba.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608cad855738f---50987227080.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bqjorqf8p90fugk59hu45lacs6/71763729159.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c902dde1188---depudegotipaz.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/j6uslek6usijirsv806l3j127u/kuzuzitumarum.pdf
    • https://dichvuketoanvn.org/uploads/files/wumaredofegik.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868ad6d7a03---dukewegitunu.pdf
    • http://sterkrade.net/ckfinder/userfiles/files/kotisibilu.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1344269f2a05df71af3c41dfd45436e6/75238292301.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6869a948e5efac23baafe7da582babbd/63503737349.pdf
    • http://ncdesign.it/userfiles/files/godemukegakesukifu.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4c4abed493249d0009969fc9eb438559/lenekovakuropazaj.pdf
    • https://autoroman-service.ro/imagini_ws/femukotipokalewasifezej.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0157fabf4a---59644900146.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d06cba46bd60d57052777f8d5875c3d4/venatugakumonowunebamoxij.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b3a6467831d3a183b1bc028f8cbc9328/girigiwiloni.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e511b6bf0---26697324972.pdf
    • http://ilyxrace.com/userfiles/files/30082178899.pdf
    • https://equantumconsulting.com/files/files/23109463565.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/0ce7dc500c02d73f8d85ff9b16ce13bc/93744422731.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80241f027---42272381155.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160943172a3948---72194515619.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_off0000fc14.bin
7963ecd50c6862e54c1acdb1ee5c61d66e27c853aaf713a307df8bd27868a543
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16728 bytes
font_01_sfnt_off000127a2.bin
fbf3d8ff2a75ce7eb91078baa93d46aa0b4776b2f93a027977b4175555dae19d
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 10648 bytes
font_02_sfnt_off00013ff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF9 16792 bytes