Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f321b018fc6479b…

MALICIOUS

PDF

92.7 KB Created: 2021-06-26 12:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5afdb925571078772850eeb4e1e9bc1e SHA-1: e754b4001dbcdc25a22d45cbea542b0a657c5a1d SHA-256: 2f321b018fc6479b2f3d2771262616068ca740e7c60cd58475e9135237ed5d4c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://hoitruyengiaocodocvietnam.com/uploads/image/files/85677306547.pdf In PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/45400185389.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969572b5ded---vetiva.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073d327d1480---nenamolubulomuliwa.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/ac2a80319c02074d64736d26b1cede82/36388559886.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5358f362---5513648146.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f543f3de1525e278c06c57f90d13b5ea/voguno.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ed03pp169ikhn17qvirj61sfb1/67624063348.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/nipezuduvanepogovifotoxi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/g2mnej2d0j1pq7f7jh9g2t3mqr/sepinotomibofedajod.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160872c705eaef---75508733182.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rdppj9cnt1unb2l64uceqd6j6o/surakerigedojajog.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tds2ink4tpdit6okeodhejee13/28658406516.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8c0e76f866f923bbaa24f5156f613f4c/2778925276.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/88230619987.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/jivezokeg.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/550dc42235f07397e7d09e91416b5cb6/nomederupeto.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/vabudesojisezavogu.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a303266b---totiwazuzuxeseneb.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/70744702922.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/vedapan.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3af4df387751ae3f2a99c2d8aacca942/70115131855.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b7d1be8d---kuwafokari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+magic+of+believing+maxwell+maltz+pdfPDF 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_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 11216 bytes
SHA-256: a8e94f4793652d3ef9c92be86fda527fcf3b349fc8b29153eaef5f07dadb3d35
font_01_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 17852 bytes
SHA-256: 21f7dc4f78b99c29dbf5e349ab1f8d509fe4b9fc496b6d526c78702ab66da9a8
font_02_sfnt_off00014d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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