Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da110e6ae5b34e5…

MALICIOUS

PDF

88.8 KB Created: 2021-07-27 04:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c79f635996a18cbd3553eef63788800 SHA-1: eb83cfb247c1f585b448d596bc7b88364171850c SHA-256: 3da110e6ae5b34e57b1e168ca56bdf109f66eca3ccf9850556e4cfb0a8e38c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, likely intended to host malicious payloads. Heuristics indicate a link farm on disposable hosting and a ML classifier flagged the PDF as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. The primary attack pattern involves directing users to download further malicious content from these compromised URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/fb81bab0a8d64c69105f628433c582fd/xives.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4db9dd7d4---nuxelenuge.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fogusikenuxix.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/30718819517.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210710082423_zc28g4.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/55225493405.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b59f69f06---77752168354.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1834033b4---89375643145.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210705_A58DCFFD40CBD82B.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160950d8a4d4fe---zinaveviduz.pdfIn PDF document text
    • http://elma1.ru/!upload/files/duxipat.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/jitoporusoji.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vewoxuzutamajo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4e3cb3b1111907811989dd469020cb4f/xamozinote.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f42d00382---kozab.pdfIn PDF document text
    • https://bczenekar.hu/files/file/39908618931.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/73492119494.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/65956890532.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e128b1eb0---zunarudatujigofu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5e68de652---davejalesupanavasopikub.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/30929102974.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vabuzamuvidedezu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080954352fa6---40137579449.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a9b48b29---nobovenopabuporipemabifon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=compound+sentence+examples+for+grade+3PDF 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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16620 bytes
SHA-256: c79713ae070cd05cc9ad1fc3b2f8db9a060be77adb1ea50807e8db0413c9a2bc
font_02_sfnt_off000139d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D4 11276 bytes
SHA-256: 4997edbbd75da821707fb466f5d1420b897cf5be8fb80024106aec492701eeaa