Malicious PDF — malware analysis report

Static analysis result for SHA-256 6543c84930868e1e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 15:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0af655c7a5e94d0528ac9be9965bdb88 SHA-1: 44a7e47d1c586b6b50b1aabe91ef72f49f78ee86 SHA-256: 6543c84930868e1ed5005ddaa003fbe0bf14b042f9dbb51ed697b60647236cc6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on various domains. The presence of a high number of distinct, potentially disposable hosts, and the use of UTM parameters suggests an attempt to obscure the true destination or to track clicks, common in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3557123a---1969238971.pdf
    • https://fallsplat.se/bildbank/file/25692483408.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/rozonurefudupegugi.pdf
    • http://mtsskzy.com/userfiles/file/tumozexoro.pdf
    • https://johanbjerke.se/userfiles/file/binun.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/975d71332ff7e922f14e243809a9b277/48843846775.pdf
    • http://congseng.com/uploadfile/files/73775899341.pdf
    • http://cp-1.ru/userfiles/files/94904694525.pdf
    • http://popmetre.com/news/files/zigidinimopidezusosagub.pdf
    • http://veterinariogiardinelli.it/userfiles/files/68867066894.pdf
    • http://naphotelbangkok.com/userfiles/files/43052584355.pdf
    • http://biancoacolori.it/userfiles/files/91951852277.pdf
    • http://synhbio.com/upload/files/97700118761.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/kudorefiz.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/jenodin.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/jalivavis.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e35087ec6---tipawasuvojipajula.pdf
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210904090032.pdf
    • http://aptwash.com/userData/ebizro_board/file/lokedogafaxegi.pdf
    • https://gadd-asso.org/userfiles/file/pojuzalobejipakomejoxej.pdf
    • http://www.cafeinca.com/img/public/contenido/file/lozajibaw.pdf
    • http://elturo.ru/img/upload/files/ritulumuvurelumefuluxedo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fairway+solitaire+for+android
    • 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_off0000e682.bin
ff852d01dfee1b29481dd021d80ad45218130f992e29c4165530b1ad359da933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 17912 bytes
font_01_sfnt_off00011581.bin
2553179a1b23705482bf7737353756d0dcd6acb8f08f4b9aebaf41d0429d031f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 10524 bytes
font_02_sfnt_off00012da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 16792 bytes

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