Malicious PDF — malware analysis report

Static analysis result for SHA-256 387c9f751d291b67…

MALICIOUS

PDF

86.6 KB Created: 2021-07-17 05:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e043b647c6eb61d6c480c165f304ae7 SHA-1: c4ff2efd547b50aa6434a12e50aef3154653ad26 SHA-256: 387c9f751d291b678b1b8b3468273283ba821c7ff2e8a5192b9230ad9221451e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089d94e733d1---25445471943.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8f3c4fd177dd6cf225c3cbf7766e4ad6/zogetagivoje.pdf
    • http://southport1969.com/clients/861680/File/30191182165.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5a57d4c98cdee034baf3cf60ab82b627/20359474356.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbbad20400008c720c09966bb53e6613/79049457827.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84d69dfc5---19841358813.pdf
    • http://3dsami.org/uploadfilefiles/norusixoparozozutu.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918bf170a9---xateteg.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/94976542946.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2144ef1ff73b1c616f6b153e33466ff1/gawabezerowove.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/luvizovuxerota.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce5e98a2af---vamivanufepadogiv.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r7khq768829doclgk1phg5qoq6/61859725946.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8e675bef---wufixenamu.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429070222962586.pdf
    • https://altonika.pro/files/fck/file/50947875549.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160817d919f347---borekut.pdf
    • http://asokmontridental.com/userfiles/file/xogurasujibufewanij.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/96e491953078246d12d4e2a89d8daab7/98470586818.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75520626c---rorurot.pdf
    • http://nensi.si/upload/file/52709239709.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/3ffde8bbbf5bb2d6f953fbba06ef4afd/24875879786.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cdf18cade9cfbec374c82e363f62f43e/80429351329.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926eb17336f---90961984549.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+cervix+is
    • 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_off0000f30a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 16792 bytes
font_01_sfnt_off00010b20.bin
764d27b5813ed13fb64d62e6553df09fde20aa742a7338370c18796153788b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 9928 bytes
font_02_sfnt_off00012131.bin
f411b30fc750be00251291d7ab069ec5403a55e2832517d6f08788943e5218dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 17000 bytes