Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9603b5e8879822a…

MALICIOUS

PDF

95.0 KB Created: 2021-09-03 13:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbbec7801424e2bd29c25e943c28cd8b SHA-1: 7d990f83efa57743bbd10a59f9371168c82c9f2a SHA-256: b9603b5e8879822a94e41d6236ca76ca6ba8991407925cadaf7be44355c17824
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=what+is+the+difference+between+religion+and+spirituality+pdf
    • http://sosonomo.com/ckfinder/userfiles/files/73160643203.pdf
    • https://globalmediaminds.com/uploads/files/70450469065.pdf
    • https://skinrepublic.vn/webroot/img/files/roxixewawalakijebiwe.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/eb5a7f055dcd328c15476b2a38594793/31874430570.pdf
    • https://franchiseharbor.com/files/files/39989040037.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a051d99c---38957630101.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2c55a3e09---fiverejapofipokowugija.pdf
    • http://slsnn.ru/content/file/sugavizatufiduwidugud.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/figani.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/vipoxorozej.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098716135060---bevejebepedonuvuwufupuw.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/wizezeravenowaxotevunubup.pdf
    • http://huonglonghotel.com/uploads/image/files/23139790580.pdf
    • https://verandapattaya.com/userfiles/files/kezekopasunewoz.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fb902e502ac9762c8b097c99f26d3e99/madekizanuzixotozetif.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/mofatirap.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_off00010aaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 16792 bytes
font_01_sfnt_off000122c1.bin
7dd5e3af064e270efb26f1807c3d8fe2f43a7445ab8455092d797964903f934f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 11332 bytes
font_02_sfnt_off00013cff.bin
3af9fd70640d8547348ce346b3171bc6e87a12101d67673a2c6624f40709a9e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 19088 bytes

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