Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d894caff0b5503…

MALICIOUS

PDF

79.8 KB Created: 2021-08-20 21:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6773318728226b1fda59d248abd0c319 SHA-1: 18ddd1392e56ee1653b5a0e9861d651d34147bc2 SHA-256: 34d894caff0b5503f7a484c92b952873d4e0a334d09b1b7a211ffdd46c582c1b
156 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. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to trick users into downloading or visiting malicious content, likely disguised as software updates or legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=iobit+driver+booster+full+download
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/qs52mfmshr06oclrfeug68rf7n/rizoruxovu.pdf
    • http://wib24-admin.de/uploads/file/tasitepopanuxojebedekavu.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdf
    • http://korvet-sp.ru/userfiles/file/65018512200.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074db4fa33bd---66696815723.pdf
    • http://noavarservice.com/ckfinder/userfiles/files/kovexaja.pdf
    • http://krevue.cz/UserFiles/File/dajokekisexowiv.pdf
    • https://repare-ton-smartphone.com/userfiles/file/29363742411.pdf
    • http://capmar.eu/userfiles/file/51986277208.pdf
    • http://etcad.net/np/upfile/file/musud.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/19422316807.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8bb1c9a98---31537032162.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/60bb3c01f28996837ea4a3f17741ceea/tiruvodokiga.pdf
    • https://yuss.it/file/60964940067.pdf
    • http://loveperfectionschool.com/upload/file/4370135088.pdf
    • http://busankid.com/webfiles/board/file///fiwivix.pdf
    • http://tz5168.com/uploadfile/image/2021/08/06/file/20210806_183724_102.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b90ad5eb---91707172388.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_off0000d681.bin
f169f5c10a5e79db67441a446c93c0b597c68af4a7dca8062c81fd1d2407c5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 16396 bytes
font_01_sfnt_off000100d1.bin
792b1a607887e1b155970a0602514da802b35c43caabe02d5b63fe019fe8edec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 10692 bytes
font_02_sfnt_off0001198a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 16792 bytes

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