Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a42fbce91d238d6…

MALICIOUS

PDF

99.0 KB Created: 2021-09-07 04:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9107c018ef5540ab5d212a8bbde30882 SHA-1: a18c823ad1d1881caaa3f0fec1b5c20fbf64fe97 SHA-256: 3a42fbce91d238d61bbe28d9a274ed718644d8091910f6bd5baf8491d38c36e5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malware. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/edgdg3ao97senl7f4b69e4l0o6/76989702330.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b332f44730---kebar.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608521e3a4a7a---fijamefuwagexitera.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/94272165561.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/b86b4ea4f164f761bcc50a70b47245cf/73538744416.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/61d009045cbd383bd01d639a98eb9b90/lutalegufoditiko.pdf
    • http://vnndt.com/Images_upload/files/99715223754.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5dc37942a984facf886344dcf148fe9/37590554542.pdf
    • http://koslita.eu/ckfinder/userfiles/files/20674519259.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848dff9771b---71551619805.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/51797443153.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb261a2190---56169114027.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/silofudikav.pdf
    • http://nuestratierrapremios.com/campannas/file/43731917660.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/jk8qa05uspefv8g1te180qcon7/vobepenano.pdf
    • http://praxis-greve-polley.de/web/editor/files/88514423031.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/buf543tcqu45hkcndi70cmqdh2/12968650834.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/58171909229.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/50231598757.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ec9838f2---6325811251.pdf
    • http://keifo.ru/ckfinder/userfiles/files/damipa.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7b6adaa7015b20248e257791e55703d7/jimivaxisogosuzovuluzazum.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5b67e799b89d3f041704dc8fb1081172/95255155710.pdf
    • http://bogaarchitetti.it/userfiles/files/97061709720.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sbt+to%C3%A1n+7+t%E1%BA%ADp+2+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e883.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 1820 bytes
font_01_sfnt_off0000f108.bin
54cdf102094c241f10ba92e31fb49afb05f34f5f757aa8aaf7396bcaf935a14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 16592 bytes
font_02_sfnt_off00010878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 16792 bytes
font_03_sfnt_off0001208a.bin
3afabc9f60c7c33cc7d742c5e4549900c44a39801faa45cef97cc213008f4465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 26512 bytes
font_04_sfnt_off000163cb.bin
65551914e1a38bcd89fa33c0c9a1c03009f83f189378c3bf55553bff8fdb3733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163CB 10592 bytes

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