Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd17ba739595fbaa…

MALICIOUS

PDF

100.2 KB Created: 2021-06-28 14:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b534b2148233ac9e9828d089f4d73fa2 SHA-1: afdb15fa7ab6179f2c38baa96f55d880647963e5 SHA-256: bd17ba739595fbaad487a5378bdeadfed68a214d80e2cd129bcbbf49c2ab2b53
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS upload directories. The presence of numerous links and the nature of the hosting suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://mkbeauty.vn/luutru/files/firorudegijagarekuj.pdf
    • https://ntwbearing.com/UserFiles/File/74063689562.pdf
    • http://snypes.nl/img/customer//files/nixadedo.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6fa6fb73---82219573047.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb3459fa77---92194654473.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/wifatemuvalesevupuwinuru.pdf
    • http://aite-materials.com/upfiles/file/67177681540.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/b44f7c65e216d699b1331fd36a0c9cb1/saligivafizetokat.pdf
    • http://polyalpan.hu/_user/file/17883885429.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46a529eff---kejaxevujudirerewosepu.pdf
    • https://clickkedai.com/userfiles/file/63483916353.pdf
    • http://longvu.vn/Images_upload/files/33191126069.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/56508867401.pdf
    • http://ackerviewguesthouse.com/userfiles/file/86516429888.pdf
    • http://antifftech.com/uploadfile/file///2021062517050096.pdf
    • http://diversecityuk.com/userfiles/file/taxog.pdf
    • http://studiovalentini.eu/userfiles/files/vabewetijupuzufo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c187fc341c---rasixusovonuroguxubomilu.pdf
    • http://donateagift.eu/userfiles/file/kogiviwuvutolamas.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3go3a1aue4dca0f5necdn3t7lj/sixolig.pdf
    • https://iwnta.com/userfiles/file/zosas.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7d4ea1f62ef26d8461404a751b5813f1/lekotinened.pdf
    • http://yourtruck.be/upload/ckeditor/file/89624618170.pdf
    • http://adria-ex.com/93490122964.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=db2+replace+function
    • 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_off00012197.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 16792 bytes
font_01_sfnt_off000139a9.bin
b615dde9f668f330684898d4beb9d593f7fa5746db7d12a2f37b6f5c25ae2c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 18688 bytes
font_02_sfnt_off00016b53.bin
c77a959cad2f9c28aabf1e271b679f8ce0ba6d079d9897b05729e34270e3c1a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B53 10664 bytes