Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a31961e7ab41f8…

MALICIOUS

PDF

95.4 KB Created: 2021-07-05 10:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd641f668a4e0aaf55188f52cfbc98e3 SHA-1: 695855e52452fa36a970d2ee872f599000286df0 SHA-256: c7a31961e7ab41f857f9a5cf410106418d0b8c1f0ffe8f083d615aa112acc5bb
204 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to host malicious files. The 'Browser extension / update installation lure' heuristic indicates a social engineering tactic to trick users into downloading and executing content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c101de63611---vabinipubu.pdf
    • http://yuha.be/_files/file/91419720229.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/akpohuhiped8bllraoebugpr12/xodolegopipenogi.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/81bba5d68e84a3db3cd7778f74c176c4/89986169983.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088797eda2f2---63582106084.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/74507002613.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupikijizaviro.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/buwutajajozorutej.pdf
    • https://gyandeepjkss.org/userfiles/file/61324575945.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2131ee5db---folubod.pdf
    • https://avigailpekelman.com/sites/default/files/file/bewizu.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607702fd868d3---wileguwelosezifuwim.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2eccf3c7d---dalin.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d9eb8fb5---46606785578.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2c12f0235bfb9269a5f40fd019c1d8a5/55669982578.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7e492fc6---zojogolizufaliv.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f9d2cea959209da7941997de8bda6413/robulebefabare.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2533c4a90e---pasorikinaw.pdf
    • http://vamaconsulting.sk/userfiles/file/zofiwaf.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3baf808ad42ab2ac6d25b5d20a3b00fd/komoruxituzeleratevakogu.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a749ade00e9---totofekeg.pdf
    • https://iohrp.org/f_files/files/23255576404.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e580a61ea---77716449296.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+chromium+os+for+laptop
    • 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_off000111ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 16792 bytes
font_01_sfnt_off000129ff.bin
8a6f8a3b25c32fcd0873b26a3215889ca916733ff57a98121019406827784c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 17480 bytes
font_02_sfnt_off00015726.bin
07a79386de156273feb7f476a9ad964b11e1dac1c5399fe62350c20010cceb10
pdf-font-stream PDF embedded font (sfnt) at offset 0x15726 10940 bytes