Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9558caeb9b0e5b…

MALICIOUS

PDF

95.8 KB Created: 2021-06-26 23:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5824c56bbde1ef736fd2c956fe8edd2 SHA-1: bac28245a530ab629ea707cecda038f5da73d2ad SHA-256: cf9558caeb9b0e5b32d130379f3681a53df0eb3441a9e08be825123c846d7be0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. This behavior is characteristic of a link farm used to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0kuloftfhbbmtvn53mui672090/judirosoni.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52527a516---13377749522.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/norokizirogega.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b494a010cda---46980181632.pdf
    • http://thrifty-uy.com/files/others/57013125202.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ed56148f---getumumaretukipatimapun.pdf
    • https://majorsagilekvaros.hu/uploads/file/34165620517.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/o52i6iqi17nuk3aq0ld6a5q65r/virebofi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74027db9bd---34839035124.pdf
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/jufiredopoxidix.pdf
    • http://seanmore.com/userData/board/file/pukevubolegara.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77b58e38d---motaxa.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/edg6as1jislqrps5o7dfg20lo3/28468335518.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c701e5b9a4---bagomolavoj.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/fikanaguxemegofu.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2634f447ac---34986626437.pdf
    • https://majubesar.info/contents//files/99366309510.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d616ef5747b4eba421d224a7f3828441/madusudul.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0npnh5updak5dnsh21rb23dou6/mefokoxavuwus.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6552fdeb89---telujikurexujowu.pdf
    • http://kraski-chernila.ru/resources/file/26967633744.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0274273e0---filesulasod.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2c5918bd---66772163491.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f9258877064635a26b19c9a12db04ca/pofojud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=adventure+time+food+chain+song
    • 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_off00010e8b.bin
fc94ff6e0e1a89eb5a6d4b019db934d648322cc480c79e31b2de8c9f0306e57c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 11024 bytes
font_01_sfnt_off000127d7.bin
bce66ef48ad73569a1854d0a3ea1af0d6e963d8599a7bde07d287e21c16eeaed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 19668 bytes
font_02_sfnt_off000159c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159C7 16792 bytes

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