Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6449da186a82f9e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 07:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbf7e92730128f84f2fc02cdf4589905 SHA-1: df8b7df7324fced0dd420712ba04b08fc8179d3a SHA-256: a6449da186a82f9e06a3ca62eb1f4e1eb7874782f91e8bb5dd214c3ef9ede5eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The PDF's structure suggests it functions as a link farm, aiming to direct users to potentially harmful external content. While no scripts were explicitly extracted, the presence of external links and the 'Pdf.Phishing.Trojan' ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=best+sites+to+stream+sports+free PDF link annotation
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0bd2559e99e4efe6ca61685376172bac/17911269942.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/35719866215.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kojuzuruwopagexug.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/vodorawebefezopimodegurez.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090804122339.pdfIn PDF document text
    • http://erictex.com/ufiles/files/27842301231.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210907031608.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/vokenon.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/83498040315.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140389330ebf---gujod.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/83624015808.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xenojeka.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/boxebiluzavuzipod.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/73001389429.pdfIn PDF document text
    • http://stevis.cz/files/file/rotamowuwe.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/wutuwukux.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/levajosololapulokexezetu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/notekigakago.pdfIn PDF document text
    • http://ingore.cn/upload/files/10345199126.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139213d4b88d---79958597979.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r6rj4f7p8t28d0heab0mrhvl2d/78766985514.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/354d29122b803e56f0d12114e2caa381/pakejufawulabexufuw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f502245473---73935650742.pdfIn PDF document text
    • http://motty-etai-sharon.com/files/files/zosilut.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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 17804 bytes
SHA-256: 1ad77084b0de847571849b8aea8374bf693a4bdd8c20a93eeff99c5157df1657
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 10420 bytes
SHA-256: 9f04114953e1a8eb7b057600498749fd89650e9278e5e7e1b2df264c71a7b28c