Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cc19bea82761a9…

MALICIOUS

PDF

116.5 KB Created: 2021-06-28 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc2c076bd2080761b20c4b6295b542c1 SHA-1: 4a80d6ff6a69967e0bb7991df799cdd3c728ce33 SHA-256: 93cc19bea82761a9bece0bec0d2d021ed40241987876bc61f10122ffc403471e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially harmful content, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f0a9947b2ed0ce4bc535654328039cd7/lisilofoxuxotune.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dffe17afd9de947ca17ca144a6862c58/75870394728.pdf
    • https://asset-books.com/userfiles/file/52724038492.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/gegugu.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/af8341a2cc27ab7c0934e9b81695b133/4015050839.pdf
    • http://meteosputnik.ru/userfiles/file/19265092172.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b07d352e11bf68df4ba956bcd9aef0fa/71473861496.pdf
    • http://a-aqua.fr/ressource/site-image/files/42162268401.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/16660015cc296559f92c1a1b4484f006/95178755967.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b99f184e2ef256622aa2ba79034d90d4/62486611840.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/136eaa95fbdeaf58aa6d958f4ae5fe0f/76603407567.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c29b1beca27b556cda750ce6fe32b589/xanoxulavupalivigezozi.pdf
    • http://veivel.com/userfiles/file/99666484470.pdf
    • http://norilskgu.ru/userfiles/file/35193829753.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e3850a0a8---zekotevokonupedav.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891acc88c70---motozedepeviwopoxod.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/vunefosa.pdf
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/80316265290.pdf
    • https://alakharia.com/public_html/userfiles/file/41988940489.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83e8335ca---89470805051.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb79cb6929---vumeterowisuvuwop.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eaf63aaf9---79361370056.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/389jh7k4hqef5idnqvk5hofabn/21957607488.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/717ec395d2839da5dc1b360e58d3cf9a/gusowimutudijogasokenusi.pdf
    • https://leosservices.com/userfiles/file/fuxawalajufa.pdf
    • http://gabortech.comadmin/file/42745913467.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616a482e83---62716821369.pdf
    • http://world-green-hope.com/uploads/files/seramo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chooseen+thermometer+manual
    • 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_off00016748.bin
8595e0b925cb73324cc801c3b11c0db303494ee72ce72da8f079bfc3ba213f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16748 18068 bytes
font_01_sfnt_off00019532.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19532 16792 bytes
font_02_sfnt_off0001ad49.bin
da9ae1959af3e7886ce2bb9477fa4f4906c64935ac58425dd8594db09f923d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD49 10412 bytes

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