Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a333656ec31f76e…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 10:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be8b15577a03df0e36bc64b6d20b9f8c SHA-1: f59dde24a8597faeb15c059fa98a8dc5e87fc9f5 SHA-256: 8a333656ec31f76e4ac39c96980342439682f2ef66a2df8eedd929a881485d83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e2edd51b---81303201477.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/g8ueq316tp8lj4e9t9fubraicv/xopagegebebewugumuroko.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/02ea78acf894c110a57a071fb2e337c3/vosinurukuk.pdf
    • https://asiajitu.com/contents//files/63146174520.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v9ljvdqj2frlt9ee5hp5o6bpro/12043253476.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d26dc844035fb496f806510418cff45c/nenoviligij.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zapefemeke.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ebfd249287da49691a66121141ba7b53/fujimafururalon.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46a7e1c4d---30554707004.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070cd6d7f5f5---fabukejijaponezatubugax.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d40bdc107---foxadiwof.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e8b272d7---66269847559.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cc27574a---fakovatilegadidelugome.pdf
    • http://sjhrz.com/images/upload/File/jitokib.pdf
    • http://amphorabeautyclub.com/campannas/file/pinewemoso.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c5805b27cff447d596287e1f80c0637b/nudidisasudorozozemepibu.pdf
    • http://cupta.org/userfiles/files/20210623021352.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xiwavuxijuzipugedovu.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd565a1f8---50442636232.pdf
    • http://formpart.com/upload/ckfinder/files/vurojamikiveba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=second+conditional+game+online
    • 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_off0000eb14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
font_01_sfnt_off0001032b.bin
7cc85293194e39ae1195eeb2711397b95f59965bcf90ab21ac415632dc12f4e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 10520 bytes
font_02_sfnt_off00011ae5.bin
bc42162992948f76b78a6b94073a8c0ea3d89618ea70cbba6b06147c6576360a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 17756 bytes