Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddf52aa4a69f646…

MALICIOUS

PDF

79.3 KB Created: 2021-08-03 11:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77ea3d223e59b3f99e5c716925f4ab3c SHA-1: 12472fd5155f08386e7917b6e82d08a2e2644b0a SHA-256: 4ddf52aa4a69f646dc3e1fe6d169e00a18012d146b4876fb9cebf357d662dafa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://galluccifaibano.com/userfiles/file/34372640517.pdf In PDF document text
    • https://nadinerogger.ch/userfiles/files/tujopela.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/31085562311.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/82431783753.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/390a8ac3a2e547e2b88ac73910850d68/916091662.pdfIn PDF document text
    • https://cncunse.com/d/files/38129982922.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/finupasoseweri.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/86772820057.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c141be3c---fexir.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tadepon.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/fevususexusix.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ca7b316c14---tuvam.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784945ea8b9---45031965493.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210619235420573715220.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ftnnbntacsqp19pjfu7bs1em28/soxinum.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nutixajupupafakoxukiwege.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071043261f0e---81421046165.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/kofazagegosilurudugadof.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d89db9b81---zumorixiji.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e5k25hchndmsjjc0g7u9a5no04/95661313580.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nesataj.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b048d45d937---24835532024.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//ruzupenuvuro.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/50299298214.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/75967054877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=biblia+de+jerusalen+nueva+edicion+manual+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_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 11172 bytes
SHA-256: 38602356acb224b8f16e40e7a1806d46bd026c9eb334c1b62a156ef7157678c1
font_01_sfnt_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 18020 bytes
SHA-256: 44e70ec44f9c67f3a96c6a702b23c1ea346cd5a5a55792bdfb075583e2fe13ba

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