Malicious PDF — malware analysis report

Static analysis result for SHA-256 8397acfcb4c9939b…

MALICIOUS

PDF

88.5 KB Created: 2021-10-11 05:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 358bb19438bc8081fd1d3111f5aff472 SHA-1: f493809308aaedd2da1eafce3dbb1ede1b57f89f SHA-256: 8397acfcb4c9939b918c34d4fcbbbba031e1257c33614ee9679a248dc83ab8ef
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. The presence of these links suggests the document's purpose is to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=if+you+have+a+misdemeanor+can+you+pass+a+background+check
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16159152c51aea---lusozobimora.pdf
    • https://zohopin.com/calisma2/files/uploads/vijiv.pdf
    • http://acsalma.hu/userfiles/files/rowulonirimufot.pdf
    • http://eventologia.com/userfiles/files/xevofelana.pdf
    • http://tryinvest.eu/userfiles/files/361771720.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/nafuxiri.pdf
    • http://udelimpa.es/ckfinder/userfiles/files/51004287739.pdf
    • http://bbmeti.it/userfiles/files/tuvujukamuvexije.pdf
    • https://dalycity.com/wysiwygfiles/file/21678547888.pdf
    • https://rubenoferro.com/userfiles/file/jopitizajabanowarepena.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vepapumovusodafovogus.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df9f9e373b---92285695842.pdf
    • http://prasongp.com/file_media/file_image/file/gosoxu.pdf
    • https://bisnismedsos.com/userfiles/file/90775136827.pdf
    • https://anjingliar.com/contents/files/puvapetenarijekoka.pdf
    • https://ixiu-23.com/uploads/files/202109072312237196.pdf
    • http://archive-2014.humandoc.pl/attachments/file/97595862800.pdf
    • https://arhstroi.by/uploads/files/notazexemerowiji.pdf
    • http://archi1919.com/smlclub-files/file/43127973013.pdf
    • https://stl-log.com/htdocs/cljr/data/files/72930543107.pdf
    • http://imaginove.eu/data/Files/nuzuki.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q69ht41q34cdpbfgq5qfcchei5/12455358101.pdf
    • http://aguito.madteam.net/ckfinder/userfiles/files/doreserizuduwu.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_off0000f079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 16792 bytes
font_01_sfnt_off00010890.bin
e687e726e6d9d7191a49d7e06058c25583904063646d901d9708a74eaf9800df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 11388 bytes
font_02_sfnt_off000122cb.bin
7ff7a75a907fa27c4c7ccf9fd147157933569a7187bf39a55f33ba9b723d3029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 18792 bytes

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