Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe3a65b701f8a88…

MALICIOUS

PDF

73.6 KB Created: 2021-09-08 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68233cb54700cc2a188c3b0c81adf743 SHA-1: daff015931bdee16bf77471b41c64d1a5e77d3e3 SHA-256: 5fe3a65b701f8a888166436339a19fede9dd6ea98c96fedd2e6eebe2ce21160d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It utilizes multiple URLs hosted on compromised websites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The PDF structure and embedded links indicate a pattern of using SEO poisoning and compromised CMS uploads to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b428de54c---95385341854.pdf In PDF document text
    • http://tiszaikaland.hu/upload/file/85607009543.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/vevirezafulafuvesasow.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137deeb5a1ab---viteluzuloxetolin.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/duviposidaserunukukal.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/nimejilotesaki.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/narinoz.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45857741882.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wabitawiranikunexepomoris.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/sasizadavaberoli.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/99184607944.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/57114440303.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/51270664554.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/zidareni.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/41795759336.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613793a92dc72---67601503838.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/lafuvunenapexisog.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/13850827886.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zojuvegasirifezumirez.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/fosukili.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/lexogeguwowesenitidip.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/34163243625.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/15f69d3419fffeffbed3fe2683f9e95c/44460425313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=used+car+checklist+pdf+redditPDF 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_off0000bc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC00 10592 bytes
SHA-256: 4351691be4e6b2eb773ff18d20cf892c3b221b289db0536da5180a6de752a251
font_01_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 17396 bytes
SHA-256: 2d9862c298f4f18e48c22631ab3ab3e678ba9641a119ad6258663654ffe0ebc7
font_02_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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