Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db9afcee893b484…

MALICIOUS

PDF

82.2 KB Created: 2021-06-25 15:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d1fd4aa9ebcfb8e492f28984794b24 SHA-1: eaa269e6a2974c1bba6c938009342cb3ab1adabe SHA-256: 3db9afcee893b484b0c734ed5d7e3ec07d2e75fce551e489624918775f0a412d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links, combined with the PDF's structure, indicates an attempt to redirect users to potentially harmful websites, possibly for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f63fb730a---5144218550.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086549b6b297---losevebeferolovifix.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/q0db50ojf9kijchp6dbu4oi46c/ronafe.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8bd6b695e38e31468883868a04e387a1/59354893703.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/854278478.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/jt24enfreuc5u12musuhkmpufq/jusag.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7adb5cc41c3793cae310a34bd7e85b20/buxijoxuvid.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c5a9f3fb02d0c3cd99cc3f458f658af7/23474353424.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7qldal0ngigvshrjme49nub6qb/41134260559.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/4k87v35vb6lphfj81k7h61v557/savubijiw.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/pajizaxakumi.pdf
    • http://dichvutheapec.com/upload/FCK/file/81624166118.pdf
    • https://emauto.lv/index/images/up/file/35355957378.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2693556278---26591254150.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa70548e02---xuwanekorusoboforul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=write+the+arithmetic+series+in+summation+notation+calculator
    • 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_off0000de19.bin
2a5a26a35fe875c9f4883750a96c1d7768b02d61f6c6d795fec2bf0ada9c824d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 10588 bytes
font_01_sfnt_off0000f61c.bin
de87125b4dc3015cce877d10ff00e054049da4bb9d312ccfb9929f62430604f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 17360 bytes
font_02_sfnt_off0001237e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 16792 bytes

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