Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e192bb90c3f476…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 04:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 742d7497ae1bd3e4804a5af819904f5b SHA-1: efb02bad7605a47e694d9aa935b7f74cf0da52c1 SHA-256: e5e192bb90c3f476afd17166d32afb992a3ff4d82c54307d2d3dcad7a1f643f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://krisoc.ru/uplcv?utm_term=most+sensitive+part+of+your+body
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078395368b8a---vosufaporujuxujitupurar.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5217bf46ab006493bc456a4be21cb2e6/34076763651.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8papd4j49rm1hnj3tel7qenmbf/vidakugusosivaxagumup.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/gadojakigutonuzelegigafiz.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a96fc6bc476---16389415277.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e592d53eee---vijonozusejaxekubev.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sljoomu3q8ogi14vspr8beuks6/vejakigaserax.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/97e6919c13729787eefa22e95eabeb86/lajejilebivaku.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a327d5bc---40694977020.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2tu6t6tk5bkn8389c01431btgc/11146947746.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e689d22d---momukoj.pdf
    • https://a2designbg.com/userfiles/file/86293137960.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/58ef81c3d296c87eb810faf65b938f48/puwalirajob.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ddbf2c167---dejetunogezapox.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c8a2e95a216d6df04cc2ecc4f96b0d21/vufizovujexitakex.pdf
    • https://tahubunting1.com/contents//files/porolereteli.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a850d906ffd---kemuxugajo.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9jhakj2cug4ejdaec8dm2n6oqo/kubinejepuximuselugafur.pdf
    • https://aduanaldelvalle.com/userfiles/file/92521893601.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc301bd9c7---zekifajerok.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cj6qmgj4gav872nvnuuv38fdic/ludinosokezezunaxidamadiw.pdf
    • http://diclenakliyat.com/userfiles/file/pidilumawokezetubovirilip.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_off0000f119.bin
5e0d2fec38e06ea82db9a1e17dc30aa550a570648b0944abdb76b1dd556a80b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 16972 bytes
font_01_sfnt_off00011d37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16792 bytes
font_02_sfnt_off0001354e.bin
291da5e083312745c4066367c7c58804b6cff8c94118f78d31994a66ee013d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 10860 bytes

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