Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51fa97b54ffc318…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4f6f1376d03815757266397b6c45068 SHA-1: cf4e646647e635caa6e0ce75d4abe52c05e6fbf2 SHA-256: f51fa97b54ffc318581127e3d47f58a946c56d6b4c50c5f10950e93367c11ace
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the presence of external links and heuristic firings points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=how+do+i+close+my+tabs+on+my+android+phone PDF link annotation
    • http://rotarycochinharbour.org/ci/userfiles/files/siluwixolibexepo.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///2499132954.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/36364863815.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911064615.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/tazazok.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/kikazixufitod.pdfIn PDF document text
    • https://2winit.com/Files/files/50653610433.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/35535341026.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210904235830304525.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/bexaz.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/rexomenakug.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/69247944871.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/30096305443.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b3b65402d9d3a26fb658a126ff58e4a0/76685693185.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e176ad6142---18900642304.pdfIn PDF document text
    • http://juentai.com/userfiles/files/82808726911.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/mupavufilu.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/77049778690.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/fugabokake.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/92201650269.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/13690109177.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/43b9d456c1362c2007dbfc57b20252c5/86867694087.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/nubon.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/libosu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 17620 bytes
SHA-256: f465b142dfbb3b8f62ed50938a1920cf5cc8293b05dfb812c9c7ea0969daf490
font_01_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 11112 bytes
SHA-256: 323e31048d54849cfd139db46387d8701eee0d2565da7ecd2f2298b179facd4f
font_02_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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