Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da4595d613cd296…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 17:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb40adfde05aaf65bd3288f145769c1d SHA-1: f57c3c755439aec932cf93ffe937e3efc2b9c1d7 SHA-256: 6da4595d613cd2962a1b78914fcc9e9c45350e1855a16a71acf5d368e70e2f4c
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically a remote-support tool pretext, as indicated by the 'SE_REMOTE_SUPPORT_LURE' heuristic. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content or downloads. The ClamAV detection and ML classifier further confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://laborke.ru/uplcv?utm_term=synchroniser+contacts+telephone+android+avec+gmail PDF link annotation
    • http://optometrystaprzemysl.pl/userfiles/file/97605637790.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f053736715---juzowibaraweliki.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109011022418624.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d8e5fd4162da1acd12aa46eede3b8cf4/20956115988.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/vikowifazegulusajagev.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f82013d48bbe18067fe967eaa0dee21/finiwe.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomokiwomadume.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sogivowebose.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/motuwosivevojibezes.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kedaresupag.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109020915569274.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6d3f1539f58b357aa1fc2cc7d51f5aa3/61034282109.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/11398046840.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/98739657011.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/73734a52c672831eeca37ef883752c44.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/zepun.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/86383464452.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/39081282414.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109050218112031.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/20776681603.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/974nt7jpa292fvnjdv3r533vsd/11491862240.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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 11216 bytes
SHA-256: d21f77bba00aba85d427dbd7d7795d83528ccec356afe5f773097181ac3deebb
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 19216 bytes
SHA-256: e51714e1f005aca98f9a85c5e97d6fc443229fe7e6bc2f8bd8d595d9c17c8328

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