Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e04287663ef2c6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 17:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c27d09dfb7c7d5cfc5bf7cb90dd96ade SHA-1: c99eaf77b9d269abe31b85cc681a3b97546af5de SHA-256: d0e04287663ef2c669bb6c8b0dc083782d6adf27ae8356ff77890128ebae268c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://studioarchperissinotto.eu/userfiles/files/tetokodojevarazu.pdf In PDF document text
    • http://orderkai.com/uploads/files/15222991635.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/4322592874.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/97873699588.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/debilodugesuzunokowavunex.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33017067130.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/46264302880.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b30889ec99f---tegewaxipagafigew.pdfIn PDF document text
    • http://healthywithhart.com/res/file/71254200921.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cc19b1e6---20110892547.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608792b203aba---64251183892.pdfIn PDF document text
    • https://sbufficio.it/file/71935546427.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lixodazusivamovaka.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/64947038238.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xafoniwejobiworezobituve.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9mgjkmaol4sli4ls72e4omd35g/gupabisi.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/50321736240.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/19863487625.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340823e5d4---58191556045.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/fakuraxevelolamijipiniz.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/95512673109.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/zesisibimejerobimez.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/79827347868.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/43be31a7274cb4c27bbf7d68c58c9f14/15777301529.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/jakuwefenifawezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sex+linked+traits+worksheet+keyPDF 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_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 17640 bytes
SHA-256: 377c224f3d7351647480d7640129898b9ad67772c721b242d0d5182a290885e4
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10816 bytes
SHA-256: 94f405aa01aff8f871b63626c3bb97e044c0834f6fa186415cc2c07c167ab598

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