Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df72b41b5b26de2…

MALICIOUS

PDF

69.2 KB Created: 2021-09-01 03:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e09d6f77fbbba1650d64757955d4a59e SHA-1: 6c6fe689618e84075fb6c838d909b526ba2d910d SHA-256: 0df72b41b5b26de213942be2f68422ea98b16c61249a75a23d9b98ec38c538b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious websites. The presence of compromised WordPress upload storage and disposable hosting for these links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=relaxing+remitting+ms PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ge4mfifuq5n1ju3n0539g6j8g5/xeketone.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/86022401925.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/74294732707.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d24be27042b---satew.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/62965896228.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/89943684387.pdfIn PDF document text
    • https://mashura.co/userfiles/files/rezeropenexol.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/jajofebamivatojumuli.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/zaxuma.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872f6a941c2---rujejilevazinopu.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/lomorotiterulitulode.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d35a57fc27ff3bbf73e279fb1d34247c/gipezurak.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/79935393645.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de79b21b5---xakomofawu.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210701192934.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fbf3e375dd0f8cd337e6a3044a90da91/71267102041.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7ef46357---gudimenulu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/64332144525.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/5777544852.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609774c972c8a---ziwezatazalegaxosugo.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/katimokulexilejatuvut.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b52029e8d---13269957806.pdfIn PDF document text
    • 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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 10480 bytes
SHA-256: d21e679fe1a368deb709b0747f1aecb06a7e915b41d4859450725d6bd97a514a
font_02_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 14232 bytes
SHA-256: 0fa9c8f24d05fd7a07ccbbc5ad0c26fe48b4288c5fc8c1a999f14526bac28cd2

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