Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a14e7189e608a5c…

MALICIOUS

PDF

82.2 KB Created: 2021-07-08 03:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9e7f28a388d08ff6208a9db40096a0f SHA-1: c2c0348a9024677f9d8e59c4c55bc34a257fe363 SHA-256: 4a14e7189e608a5c6a2e0545d60c360647d90844f5161e67dca70acc25bc24e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

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://burrburroughsfamily.com/clients/55468/File/tafasanezeleduvo.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dfcea46f5fed9dfda73c8a13eb09aa05/bilobowisubofesimizukisu.pdf
    • https://martensmgt.com/business_school/uploads/file/65986570121.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a503c65ce82f318c36528f3e071ccfc8/pejale.pdf
    • https://mfdesign.hu/files/file/96069082227.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbf7c91f9---werevix.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6c9040676bb1c7fe18f0738c2cea3dac/dixorisa.pdf
    • http://brilspa.ro/userfiles/file///85821813370.pdf
    • http://dtcguild.org/clients/80367/File/tadalavadiguniwina.pdf
    • https://combrooncom.com/contents//files/4401050915.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074265477c48---56018287810.pdf
    • http://collegium-connect.nl/ckupload/files/zabodobonurikasagunepomiv.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/79mn8eqqhck1fecscou4n9u7v4/17803597981.pdf
    • http://sintellect.ru/Repository/file/61715332342.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/10738cf985e1ab8264f0312aa1ce07c6/17168757151.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/xefufirobuzerugawigif.pdf
    • https://champion-osk.pl/userfiles/file/jabevojur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+combine+2+pdf+documents+into+1
    • 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_off0000ddd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 16792 bytes
font_01_sfnt_off0000f5e7.bin
d8b1414c1558477ab48cbfd9c14f694d9c12a640439eae2c69674b89d59f4b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 10960 bytes
font_02_sfnt_off00010f35.bin
a8e92cdc44a41835745a8849aba8beed1de9b298052c192f0df9c06a70bc56e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 17180 bytes

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