Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe024779f43afb6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 21:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a5258db6cc02be56d166f5a3cf35019 SHA-1: fcb9da88e32d736e32482a9068df4bfbd90e61c8 SHA-256: bfe024779f43afb69aa91e97bc78bded7170d9506318ce1edc3c31e98424e020
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

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 https://infrive.ru/uplcv?utm_term=droit+des+affaires+6e+%C3%A9dition+pdf PDF link annotation
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c577580bfc9---31012387973.pdfIn PDF document text
    • http://mayjack.com/upload/files/sefuletevafewawufa.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/65478766865.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/25008556184.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aca608041---42305143793.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b4c00752a24af4ccdf1b3a13e1d753d/49361650016.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/zofilafarixilibene.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/xabumawikoxepo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/17300644549.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5bd8b7adb161343a7b74c839e1eac81f/pabifibav.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/684281db280e5675fb5dbf42dda2cf31/75838451887.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/64437700601.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454747bdb---kejaxojelodix.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/liwatarud.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/87210307034.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/39329061682.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098679d46e32---medoxikifufak.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/wadumomojupewimuwugizemox.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jalutozakipolakizizak.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210525002905.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f13702474bb6e19489a6ba64cdf2924d/98100618508.pdfIn PDF document text
    • https://ottopianos.nl/files/berimo.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/pusuzenuburas.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/426f1c4366cbc0aee5d5c4e0969720f0/tinikomosixefeletu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6d496979dfb9dd88bf1b7f08fa8556ec/fazewomelikakabe.pdfIn 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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 19700 bytes
SHA-256: a8cc55832e3f0bf783bdc26911098b135a314b5776c454d8a7149cc8697ccfa0
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 10768 bytes
SHA-256: 700ecf5986ca24d5ea773e6c6cc0e9281b90876f5e8f6544c7169fe2fa0ca211
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1