Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a02165f7dbfe22…

MALICIOUS

PDF

75.8 KB Created: 2021-09-22 18:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f4afc846862d93ca226635bfda3ea83 SHA-1: 5cba0b0966c4c2c317faa1b1ba92e1a4e9684c6a SHA-256: 16a02165f7dbfe22fbc05a3453c937e55714f54d11b06e0321df47ca63d03f46
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure as a link farm, with links to compromised CMS uploads, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://studiogalata.it/userfiles/files/zavokabudozogal.pdf
    • https://creteservices.com/FCKeditor/userimages/file/79048231322.pdf
    • https://cantarefides.ro/admin/userfiles/file/84979372051.pdf
    • http://xinyuemu.net/assets/202109/files/20210903224934203385.pdf
    • http://chelseafoodmart.com/uploads/files/jufexavaseririd.pdf
    • http://svarovani-tig.cz/userfiles/file/jutumudijazijigu.pdf
    • http://areopag-group.ru/sites/default/files/uploads/tezinosuxap.pdf
    • http://elazentrale.de/images/uploaded/file/lomutururumokeregibiru.pdf
    • http://artiguardia.pl/userfiles/file/36532446914.pdf
    • http://tdsns.ru/userfiles/file/94220204067.pdf
    • http://tamtamphat.com/upload/files/nasijowepimaxonobawad.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/f0ulf62mtd8ohmkb7o37pdfq8t/pilawijifipanazotiv.pdf
    • http://ficfart.org/userfiles/file/24571947352.pdf
    • https://projetovm.com/uploads/files/31603506199.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/74820725304.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/86990fc8b9c9f3252c422463b2e64641/55410102933.pdf
    • https://lexconsulting.ro/webroot/files/media/10736054195.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/zasevokumuvevim.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304051a3bfc---2297550177.pdf
    • http://hongdanhaudio.com/luutru/files/xudej.pdf
    • http://divapharma.com/uploaded/file/54843803235.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+great+game+peter+hopkirk+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c443.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC443 16792 bytes
font_01_sfnt_off0000dc5a.bin
fa4060465e43e201476c383af304920ccf4d7dd44a2dce25914c931dc16aa366		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 10684 bytes
font_02_sfnt_off0000f4a4.bin
27911da645a08402a05f1bbe0394b4f07e1f244c5db12679f879bcae1d9a10b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 17436 bytes

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