Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cacf16c14189c7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 14:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1533432ec661c6bd28109af6d872ac39 SHA-1: a43bdd89e4252f8254555824bb42a3b5844f65c6 SHA-256: c6cacf16c14189c71222b069e38f8d25d3e34c46dd97dafbf59399b7f78571f4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=conjuring+2+full+movie+in+tamil+watch+online+tamilrockers PDF link annotation
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/31151780940.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090303190868.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/lunamulizifowaxiramaf.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614269000397c---pepaf.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/356061e0eade1266560aff981aa77b71/50977944806.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/tobot.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1390e817d59f638c29873ab2a4c839e8/zatifafajemokuvigakati.pdfIn PDF document text
    • http://josquin-capella.de/download/12499386646.pdfIn PDF document text
    • http://mosjob.ru/images/file/junubireguzaxutiripolas.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/letatagegiloputi.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/duxutegetiwetufifizasifu.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/xopejar.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0482548001630728961.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/zazixateketogujogi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/91683142707.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/vexelopexukovivezegix.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/80264670441.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/taninupiwotokitozovewozu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gaongtdpo23hvgqgq7g4junnd5/zawosuranotil.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cdac4833750a9af1e4840f2bb0306724/57360211153.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/pogisebajokof.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zovogajidasimajadojet.pdfIn PDF document text
    • http://harlit.com/upfiles/file/9193738932In PDF document text
    • 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_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 18004 bytes
SHA-256: 75fd71fa3659782671e4baf228ea4ca517f8d7f126d8e35e35d61ac9261a4324
font_01_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 11408 bytes
SHA-256: ea9f10de04dc38fb3de167f948613137a3f084965b4bdc8fe1c9b1c62ddb2c9e
font_02_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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