Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d581068afb7a935…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 12:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a91ec71176ba7261887ad88b24b33c1 SHA-1: 84acbc4bde9882f799707672ddf5a2c4dafc62ae SHA-256: 6d581068afb7a93550956c1c36ad3a2b8b2090fe621ee64ef117f2b15c145516
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF document exhibits social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste commands into a terminal. This is a common method for bypassing macro restrictions and executing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading and executing a second-stage payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3743957daa410a39dc6ed9d67e4ccb65/7934446100.pdf
    • https://aitalk.vn/upload/files/futiteruzotevijijizuxewos.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094357065d2d---juwolutijitamubumod.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/buxakanibop.pdf
    • https://fallsplat.se/file/78770260159.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71406c956---4612989682.pdf
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/tanezedadu.pdf
    • http://norilskgu.ru/userfiles/file/70442531606.pdf
    • https://jxloanchien.com/style/postimage/file/22740363022.pdf
    • http://valsadindustries.com/userfiles/file/wokorasu.pdf
    • http://buddhavehicle.com/userfiles/file/33154268020.pdf
    • http://akcjonariusz.com/UserFiles/file/72445491300.pdf
    • http://hydrem.ru/images/file/simutojona.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/98974193947.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4206972d2e---jeturidotevi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=battletech+data+sheets
    • 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_off0000e51c.bin
800b63236ec0cd1596b1e47467d746626643ff6766010492a8aa8ba3835d3769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 17524 bytes
font_01_sfnt_off0001133f.bin
f687a978410317b6d3ae8d80228af394fc56d6df8cf28a02df22784952183cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 10104 bytes
font_02_sfnt_off000129f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 16792 bytes

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