Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a24bd9c746cd7b2…

MALICIOUS

PDF

121.5 KB Created: 2021-06-26 22:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: adfe9f9f47c89491ccbe71aca12cc9e3 SHA-1: 04e195e4a7adf57274e077982399c681287512f7 SHA-256: 3a24bd9c746cd7b205aa06fb3eff8bc3b417ccb66db24bc263016d689cd59297
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the PDF as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2ca6e5f40c80c578cec0f4f161a228cc/lodolonosodu.pdf In PDF document text
    • https://unibel.pl/pliki/upload/file/42695250698.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784a8a592f1---48939247267.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/81313873743.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609257b556ecf---mikujidaxezenidefu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d399d2da---82942130377.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/16948572337.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc9b5a116---6163371926.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d4ag7iqs7kouf49f1petqnulv7/sexit.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bbf0aed44---50724237692.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/75230629391.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608687d6cbebe---sopofapagoda.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1uvkabnpd73udb0c6jkcfb2gh3/liwagawijen.pdfIn PDF document text
    • https://telenovella-bg.com/files/62341975158.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/12u8f810r81rbp49617b2d4h59/pigugapajogavinedoweraz.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/12448229060.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1c38dd86c---38662735318.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/371d9064082ed4b55f81b4e3979eafc0/88493160381.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/sgj616muopisjld2hmb3h9td5p/20884674136.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b455e80c---wuvimolegif.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/74732206492.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/41051284298.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c6014c16---moromuwuguwewoxasexibavet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mutants+and+masterminds+3e+character+sheetPDF 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_off000175a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBB 10736 bytes
SHA-256: d0642930e42547896cd54d28cb6c80b5617c406ab99cf8e8e8b3d4710df4d7ce
font_02_sfnt_off0001a630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A630 18608 bytes
SHA-256: c17c97f2890aad70ba1144e32cd43ee55585fbabf7dc3ace631c295e0eea0cbf

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