Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c8bb1338f614cf…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e25d93dd1de3b414bb3a4d0256e82650 SHA-1: 315c618f80d57c465d77a19a562a92a0d674a504 SHA-256: 61c8bb1338f614cfc6d8774944e5a472c4ac0de1446d046c5bcf10dda7c391f3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

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://crewmak.ru/uplcv?utm_term=creative+iroar+go+user+manual PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41e1c8c63---20992561754.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fa85fcf0a5cf4c1933c80a1a5bdda2dc/niderisatanuwituradive.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/37813336194.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/19733ba1fa7f786b2cf0c4c57418d1a0/5539548708.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/09f0037dg2ck2i6kf269cfv9hj/sosozanezalisigu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7610c1b33---fewabida.pdfIn PDF document text
    • http://anupbolivia.com/images/files/merizilufaxebegudesa.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8bb117b47b25b3e1661b39069db93ed3/79321152524.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/pafizofiwo.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/16723868377.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/munokozexuvepunet.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210621103058.pdfIn PDF document text
    • https://bnovum.hu/downloads/lorubupowize.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e6d4098b823fa192411dd766fc77dee8/vuxid.pdfIn PDF document text
    • http://hkwwta.org/userfiles/fidinamobopal.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/57502921730.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b50730b2---82222152315.pdfIn PDF document text
    • http://markone-tools.com/upload/files/21513653807.pdfIn PDF document text
    • https://serka.com/serka/upload/files/sogapuxijopuwulimozer.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53754307703.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/63bba3b8552871a158c8c606c8b235d2/57702834241.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/44f5da93008d36d9acd0bf51a84e7361/binuwiwokebebebiwe.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/vhb8duqma1froet9arpqnc3g4d/94399782368.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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 10648 bytes
SHA-256: de128fd7b3b832987de56252798b3dab694d4208c160c2a9f4a8ada0efc466c0
font_01_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 17500 bytes
SHA-256: 8f734c018e0df0abdf64a391b85414f38414bac2e3522ea55833b231613af5c4
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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