Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf0938bbbc18108…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 10:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30bb03cdf32a244839db55cb0131f12d SHA-1: 48ef740eefc3b99c6d9e82c0b14a182796d38b96 SHA-256: 6cf0938bbbc181083c9f8dbe6fa8396e2cb4d4023fefb8dec0794b40fb881a6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress sites. The PDF document contains embedded URLs that lead to these compromised hosts, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56dfa9a63a---70260101726.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/1cbba657a6b6981e4c4c2a6956d151d2/1792266497.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/39stjubcktrh3iqgd5k65ed8tr/vuzerewexufovozozajos.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757b6ca0427---bavaxasupo.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d01b5e922---71729183075.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7109f9062f15c24f88019e6bd0ddb222/14731021164.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/96a087e3fd52a665dcfdde1e68124f35/76115632756.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad883a468---dikuf.pdf
    • http://cementfeet.com/userfiles/file/kudebawajusoxegukide.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4e62d484122760418905217a1e22dad8/gidulalat.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/a74hi6kbhroesu1oacq3kf3554/32946734031.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/67c9c4cc5bfdbebfb4bd29ff2a284b6b/69116076818.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/96362708008.pdf
    • https://baxsporthorses.nl/userfiles/file/rovozadixomunaju.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b96888ed---dapabijenozegotiwu.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098361e37aef---zozezurivezomid.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607756424183b---nexajuwaxax.pdf
    • http://mintaialuminum.com/d/files/xekavovagixorogemumi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92ffdbe28---24006557564.pdf
    • http://apluskleaning.com/admin/images/file/xabivo.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b50fddb2c5a---xozuxuzovasimuzopesa.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a538f104---vararolejedarur.pdf
    • https://anmoul.com/userfiles/file/20247382559.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/a7l7b4dc09o9fr0fsdk2526r6s/mogezukamewupuratatajewop.pdf
    • https://notrepanierbio.ch/userfiles/file/70534709253.pdf
    • http://www.lugashotel.com/data/editorfile/73338164883.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=to+the+mysterious+island
    • 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_off0000ff6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 16792 bytes
font_01_sfnt_off00011786.bin
f90ad8813d28d4b081b3d6f000aa470c2b2ca9843b3552c0193b816ba12779e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10688 bytes
font_02_sfnt_off00012fdf.bin
6989f49bf1ddedbe60d58659eceb0b52aa8c78298da93bf4640759a8f97993a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 16664 bytes

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