Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c252bc33f166b6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 12:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 273d3d55cfcc75b3d97c093e46a88ba7 SHA-1: 13d8a329bb8036e7dcef1c7890015d1a62cb5e3e SHA-256: 42c252bc33f166b682ca35d7e0c9e9a58d96a037d68265d7ac7fa6e8ac62ba21
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fa-vietnam.com/webroot/img/files/fofinexovige.pdf
    • http://thermcom.cz/userfiles/file/40507640096.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7cacf9bb---26701824957.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a84d9e84---zekanupi.pdf
    • http://resurrection-life.net/userfiles/files/sozoloxarudiwudosugeze.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fdaa199dc8---99581673902.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gt0e2rrpigv4v9q54fmn3mhnrj/84472364026.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/agadih6khifm22ms0agj4m0gc6/60514148964.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b379ff5b8a7ffa2b5dadc81396fd92ab/29412248355.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c8b7c10d047b0be491a63b89eacb3858/situwefetufefemowo.pdf
    • http://vyrukrc.lt/userfiles/file/rosulufogegemiru.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117a83f1402c---37211165555.pdf
    • http://duocthientam.com/uploads/ckfinder/files/wuzekoxelajagamisubok.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a545b18a3---puregipanujete.pdf
    • http://unibeauty.com.br/ckfinder/userfiles/files/lakisuke.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/kupata.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0c1b245ed55c8f2d9c791c5545fc08cd/28813951405.pdf
    • http://tafgambiatours.com/userfiles/file/45284731513.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952c7bfd92---rologatova.pdf
    • http://al-bandak.com/userfiles/file/kisoti.pdf
    • http://tbvshungviet.com/upload/files/17400397536.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50b25ea37---kezozudipurazinaduvi.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/narne3dt6ehuv51l2vud637t44/30820994264.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/siwimejifobunodeguju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=down+syndrome+guidelines+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_off0000e825.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 16792 bytes
font_01_sfnt_off0001003c.bin
44ba138a332940588bcb0ceb5f1ba7c2da69ea0f1bce835cbc3134f9f469d614
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10884 bytes
font_02_sfnt_off00011930.bin
dd93fb51d8848d126f7a7e5522118641114ab88d7ff741b1063f0c9957034520
pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 18652 bytes