Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba9e09769973016…

MALICIOUS

PDF

551.7 KB Created: 2021-06-27 04:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf30daf8761b0a80d5b5860e48250fe8 SHA-1: 0f7845551a0809573661df0967dde114f9b2440b SHA-256: aba9e09769973016520aa3b6c7b2c13f920eec66e0be02b8985ae56e11c382f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document containing a link farm to compromised CMS upload storage, suggesting it's used to host or distribute malicious files. The embedded URLs, though some are marked benign, are part of a pattern often seen in phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9118

Heuristics 5

  • 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.
  • 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://pkynfe.net/userfiles/file/99896394734.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071137e66618---86404283747.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acc79256b20---vebuxesaniga.pdf
    • http://nhatngungoisaoxanh.com/upload/files/93359058522.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4sae98v93oa72skme6a69m3d32/xuxafoki.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6b31688f---fagase.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6a26ec59006a8e648140fc8376b480f7/98456187211.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6cb179b866962e479d8da981d17ed424/womixefil.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/nofumobesenuvupazufu.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/31371991961.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed9c334c5---xudiwipad.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/468c76200931447f86356d28ab493d25/pelugumafupedif.pdf
    • http://activesolutionelectric.com/images/file/vatawaxoxudujenetidavaj.pdf
    • http://yuanyoujie.vip/userfiles/file/fopatefewekifiref.pdf
    • http://kehlux.lu/userfiles/files/59857235992.pdf
    • http://tipiland.net/upload/file/pikoremaxawevozezufidek.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082f33fed814---38358563338.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bare+acts+of+indian+constitution+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_off000832ed.bin
6771d28586d72f62afb175f1226c50a8594b0a4b06cabae19419cffd8e204a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832ED 10720 bytes
font_01_sfnt_off00084bb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BB1 16792 bytes
font_02_sfnt_off000863c3.bin
9730d9141d5d1b4d305d3dc194ba4ca17d6ca8ce823112eb33ac31203cf6baef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863C3 16608 bytes

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