Malicious PDF — malware analysis report

Static analysis result for SHA-256 7949a8c2013899d3…

MALICIOUS

PDF

83.4 KB Created: 2021-10-05 16:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cad8c9c601f0d9172d8b77d83e7712cd SHA-1: 3d01036c39297c9c235e2fc8decc7a89d99681d3 SHA-256: 7949a8c2013899d3dd48720404924a181d94e82f36a685ffd30018cc59e3918e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=surge+ahead+meaning
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144824344b06---34063668874.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615bf1a37ba17---76207318414.pdf
    • http://c2r-auto.com/uploadfiles/file/2021091905580673499.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317c4b20095---95128570642.pdf
    • http://geomanteia.com/userfiles/files/bitofetinanive.pdf
    • http://www.agot.pl/upload/file/82814582354.pdf
    • https://threadworx.com/thread/admin/uploads/file/95212298040.pdf
    • https://pioneerlift.com/upfiles/editor/files/tedekunezimimezeten.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbdbfa8cb7---gupawusarezofotirelenev.pdf
    • http://synfarm.com/upload/files/luwofox.pdf
    • http://saxonrt.hu/img/userfiles/files/46048000832.pdf
    • http://www.bandungmesin.com/file/pufegoxazetimewudi.pdf
    • http://mrcookie.tw/upload/editor/file/061508575548.pdf
    • http://kxnjl.com/userfiles/files/soruxoxolakixapiga.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/fuxaz.pdf
    • http://clinicaveterinariacene.com/userfiles/files/muvopelipiniparufixuvogip.pdf
    • http://textstricker.de/benutzerdateien/25564177397.pdf
    • https://diamond-marketing.cz/soubory/83344684950.pdf
    • http://ahjygjg.com/upload_fck/file/2021-10-4/20211004043048942786.pdf
    • http://budget-pl.com/ckfinder/userfiles/files/66873513187.pdf
    • http://superfishinglewood.com/uploads/files/vavanigipojabof.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/2240501.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_off0000db3e.bin
b169671313af7edb338caa2ac004d68cacbd8e9a8edbf980031a809f7ee6dbc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 10436 bytes
font_01_sfnt_off0000f274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 16792 bytes
font_02_sfnt_off00010a86.bin
e50f18822e036c716c195fdc559a10cc19e2c9f8f209bfd033792e0f171d3377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 20984 bytes

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