Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dfe3c1e4218b1a…

MALICIOUS

PDF

90.6 KB Created: 2021-07-18 07:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b7aa7eca7c390ff75fd3be0dafdffff SHA-1: 7c0b0f8edd826ad0db53a1aeb5f17548bfad9cf7 SHA-256: 04dfe3c1e4218b1ac429a154763c4819f424a24afdd90803f559061d4f9bff41
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of these links and the detection as a phishing trojan strongly suggest an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bahamianbrewery.com/ckfinder/userfiles/files/9675560226.pdf In PDF document text
    • https://dianthusindustrial.com/resimler/files/xolenujux.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071e56a45899---tuzerubolezemaxoxuxiwomi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/389c84a20818df99e4c69671eea493d8/20173999226.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/aff0a46c7cb7bc53d19b9b96810a92f7/36727624814.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16089af6164d61---miroxaxe.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4r1qf0iq3o5mjf6gcsoq7lhhv/vajokepisebes.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ce4f522ea7537866336d3ffd887be6b5/96555120904.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081767cdfc59---mibivixo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/og351qv1p6fvjlsm5dlcepjui3/48531390217.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/vatariruxezididumeso.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/882ee7ccb23e994c08e1cad3d16ae6fe/gadavanavobonopobusabobet.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/11795453026.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/18639681654.pdfIn PDF document text
    • http://dgjst.com/upfile/file/81663001153.pdfIn PDF document text
    • http://ore-processing.ru/d/files/92874258621.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/firuxalilemabo.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/38838636549.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/suxovobuti.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/lolowigadusukigojavev.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/44416079583.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/silogemowetupageruxakaj.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9ef1d2a3---sarurelonezalelejew.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5fb0751a---pozivivelinozovelekijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dhoni+2011+world+cupPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 10532 bytes
SHA-256: 073098e6378c57e95aaf47161a19e208f547ce17b8b6f1eca7c0291465d257b8
font_02_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 18476 bytes
SHA-256: 29b5eef9d681b5763b08f4ccdcbf8cc9df5c6bb2071ae34f02569021dde3e29b

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