Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b39c949b3cf8b56…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 04:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0727e329f0c8b51b0700262b784824c SHA-1: a7dbd7c2458a6eb7f6faab49b492c7e6861e8d7f SHA-256: 7b39c949b3cf8b569ca46babc219e1fd513c4c607a26dc3c1c564e2b7e8016d7
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised CMS uploads and a lure for clipboard command execution. The document likely aims to trick the user into copying and pasting commands, which would then be used to download and execute a secondary payload. The presence of a password-protected archive lure suggests an attempt to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://accessibilite-salle-eau.com/ckfinder/userfiles/files/61553045073.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfa5c1f76---40583006075.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e2h11610p5msfk4a81ihj3811e/42200770560.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/84c676e4120df23b3eabd7bbbf411a42/3722904818.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59d2e552a---18182723097.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74717dc6b8---87022211965.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae93b58ea---kedubunilitamen.pdf
    • http://teechart.com/uploads/images/files/kutogirawomiraxogulosago.pdf
    • http://asianmosaicnyc.com/userfiles/file/jupobitotax.pdf
    • http://jgbt.us/pds/userfiles/files/kaxikewakakuwizatinadiza.pdf
    • http://matsonconstruction.net/userfiles/file/85710334800.pdf
    • http://garmagostaran.com/Upload/file/judewano.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a76f640c09c4e006c817da03adb93d2b/mowurafezobofepokubiras.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cb18108c7---detip.pdf
    • http://balone.net/_upload/file///giduloxewolumudonimif.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5f11f0f2ff83545b834fc8a29ccadc7f/perofiwemukutilumusopu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093acee3babb---50007345802.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef064645d---mevaroxadefosofeb.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e3826f3a---59732051993.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160896d4d74bea---lexidefuramivesuxabukapu.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/73d32c2e01daf534d175b175e2d78bd8/43651133421.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9afdecffa---45607574679.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8e80285c---72770995319.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+find+wifi+password+on+laptop+windows+10
    • 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_off0000e402.bin
f3d96ce820565cf37c7b64b35d634a550d66a7cf584be3216330e1d6e6ed678b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 19060 bytes
font_01_sfnt_off0001165a.bin
502ec6b118678c0beebd58deef0bc338c75a58701808998afa03509bb09bfb48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 10608 bytes
font_02_sfnt_off00012eb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 16792 bytes

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