Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c0bfd8402179f2…

MALICIOUS

PDF

69.2 KB Created: 2021-09-07 20:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 517a56fe5c039638221f2d3e94c332f6 SHA-1: f8204a2ee3abdba5e774e0f825d3b0363e95ab7d SHA-256: e1c0bfd8402179f2a8eb0da1f7d334792edca90d869d9da2fca636b168d49d67
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it functions as a link farm, pointing to various compromised CMS uploads and disposable hosting sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.db-ynox.fr/ckfinder/userfiles/files/tegesixemaw.pdf In PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/67998950260.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aefba38a9---79096668220.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/jakovu.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/39763071509.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/boxumobetubu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b66c14ca8274ab66dd46b99c481a3202/fomixasowufazivito.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/mavomipifiditi.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/31349401195.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/sibafezuxowaniti.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rj2ea9dh60t5u263mdhe32d599/87136943180.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ecf59d972f3f1cce8c7d2fc24b2df71d/80225581723.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/62087120458.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/15907405765.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kumexelibox.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f04dapdon27dmkqd9buhfe7hc3/88366421831.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/64855140511.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/35283783852.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/90236505704.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/96471565720.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c710d8f462---lapajuxupifidaninaxawomaj.pdfIn PDF document text
    • http://www.puhito.hu/uploads/jubimaxatoxurid.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9ede0131a---xamitaxitotemedefor.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2fiv6ac165u0m95ecvh1286ege/soxirige.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2765614e---wiveralis.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f8a48decdfb6ae897d43f29bbbcaaf7b/fefod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nursing+management+and+leadership+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_off0000b476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB476 10904 bytes
SHA-256: ae6c815bbdf74f4dbbdcab315db1c9bcb0941d11477c75a55a8b834e2fe8fbbd
font_01_sfnt_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 13888 bytes
SHA-256: dc5f491ab525a157273dff4c0a305e214e24f0c40b82181040e49dfcf82f3c59
font_02_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1