Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3debc3d7d5fe41…

MALICIOUS

PDF

81.3 KB Created: 2021-06-17 16:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 936d90fd47fd7e411a5858bca36a8968 SHA-1: 790be971e2a25e4dcf8f872a0f94d5c44e64d76f SHA-256: ea3debc3d7d5fe41dd51497e5a36f5578eb82747a28e62eee57e70d282255a51
156 Risk Score

Malware Insights

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

This PDF 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 sites, suggesting it functions as a link farm for SEO poisoning or to redirect users to malicious content. The presence of external URIs and a link farm structure strongly suggests an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f931d2a69f---26597423407.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/00c83ef958d4da7ff4aaedf8d85100a6/zamaxemoka.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef7433a26---64871716260.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071764b7881a---62018110976.pdf
    • http://studiolorenzino.eu/userfiles/files/84263618865.pdf
    • http://ambvet-trefontane.eu/userfiles/files/putisenexetozipe.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a3c86067---nitikosuterojorivaresuwi.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7104958a0e---8460220432.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090b282b8f08---wedunolufidifapenumim.pdf
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/nosejuv.pdf
    • http://plafondchauffant.fr//img/user/file/lixagiziwivotubevo.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/4e306363580b24a3f13857473640342d/2226508866.pdf
    • http://veronikavilla.hu/userfiles/file/wixazibekibipetufap.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a560fd29d49---97810648211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+madea+on+the+run+play+online+free+123movies
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa86.bin
48ed53a307bcb7f30ceb8708ff9b8da0e10f1dc23ea36d7f528b283513c879e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 5916 bytes
font_01_sfnt_off00010e9e.bin
611f5a33336e4a332e189b7707f9fc165837b0cf607b5a49750456c649368d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 11748 bytes

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