Malicious PDF — malware analysis report

Static analysis result for SHA-256 636349b5bcdfad01…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 08:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acb3ac58d4a5d53efa78b8dfc5753808 SHA-1: d2e956169c571ad35d01770d9d8d743a967e1bec SHA-256: 636349b5bcdfad0109b9bec930af15fd443a405fa53e9907c56f1284b0c8a218
156 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 heuristics reveal that the PDF acts as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. While no scripts were explicitly extracted, the presence of external URIs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malicious content, aligning with T1566.001 (Spearphishing Attachment) as a likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fgbih6o9urmuo40d53q2veimcr/kupimuledivusu.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624aa9a994---62111337370.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/97822306409.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/funipexi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9a06f390d6642fad9c31541167670ffa/82071982902.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6e00d7253cb66a03b9519cddcd897083/71072600955.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/skaks18ikfv49lo8q5tbi7ij4h/21702340033.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/70834277450.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4170edaa12078ba1c67bf26c0f6090f9/wajexunejovopa.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mimebogul.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/kimurixesuj.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b750610eb1c---64728521740.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0e6996f35a77fd252d8b0fdbda1336f3/85775721965.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/99bee5ee2f35677d0369df8190e3cad2/pitizuzivovofotov.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/23091133955.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e82hvdjsjckss666bj5c6n1tg6/51216252539.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/32697241780.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/zinawiroximenise.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/rifonexodigumaja.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/2889588787.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/quv524veog9svagqs1cdta1ed4/lolilolasifetiwejakes.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/06e16ac674003f056a6bc8f3b2026e4b/28661658367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=push+to+the+limitPDF 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_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 10108 bytes
SHA-256: f8c52896f304c3490b08c50de1e0737ced49d0de161fcdba26b5e12a982d1ecb
font_02_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 17140 bytes
SHA-256: 4e40635d643d4b6420b90889a8d0152b985f1724473a74eba62aabdfae193ba6

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