Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a915b2c8e19f98…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 14:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15b3ffd0952070b4286fc67a881f93ac SHA-1: e450b43ac2a08012f2d44d830d463d19452ffe90 SHA-256: b3a915b2c8e19f98d0e76e1da809a59370337b3cf7e166787f713addbe9fbbeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aduanaldelvalle.com/userfiles/file/bonuvesefodetonufa.pdf
    • http://akinmedical.com/uploads/file/33135514405.pdf
    • http://allycatering.com/userfiles/62389809588.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ab6c9e15673a9bcbbeb47143a50da18a/74182010920.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0df44704a01f66db77d673e4c8168e21/7885150586.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/30022777572.pdf
    • http://atenngo.com/admin/sites/site/documents/konadajamazeximiwa.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7223398e---jolepa.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602073729.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/1375ca4b38894c196a933658cfda0e31/wevisujeboxetegi.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/234ppb4p2lkam8duqb5d6s2rq4/jigelurepajitozadi.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/saslrgnleddcttsgd9anl8sfro/suwematemaxub.pdf
    • http://uniquecharacters.com/upload/files/35130511481.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dfea9431b5d0945c1c66403559e26a8/38342802876.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p1qbhjmqo5cmkr80c768iaum8m/ladidetaxulobejutunu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pulled+pork+and+slaw+burgers
    • 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_off0000f135.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
font_01_sfnt_off0001094c.bin
8661ba776756ee339a83c94f8e388fd578b788ccf06a5143ee50dff2a7ea61be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 10796 bytes
font_02_sfnt_off000121ec.bin
97619ed7aad2acedff690ada2aa245e9f8d3296bb3dab920034d52d0e10a5a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16992 bytes

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