Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6bb85c60ea36c5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 18:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce2591519ae41fa8256ffc6aec44d26c SHA-1: 2c04aa7f3600974aa0aeb0cc116844defa92dffd SHA-256: df6bb85c60ea36c511f5a86edaee7e0daf9daef3ecce4886abf1eea9589b91bd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The presence of these links and the nature of the hosting strongly suggest a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://korea-labels.com/ckfinder/userfiles/files/sinofumonawuwiwiratej.pdf In PDF document text
    • http://mariamozharova.ru/uploads/files/gelolegofebesekifulile.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609878d4aa05c---13026279257.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/273b93a1041e30e338a4f018f83f923f/bilowuvixarexekagimire.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/14708518460.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/20454272955.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/9953968870.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b85221b13---rowobitovudimumusukapa.pdfIn PDF document text
    • http://bienbao.org/uploads/files/61287026036.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ce0231e0796a91f318250146f8025d06/dexexifafiditu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/inrk840rg49k38396dnhafahu2/7466113931.pdfIn PDF document text
    • http://midel.me/userfiles/file/zaduvokemolimo.pdfIn PDF document text
    • http://namdolove.com/FileData/ckfinder/files/20210528_4172C8E34D1ED960.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/natova.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/civgtue8pdtqh7ca5a8d5a2s00/80030031614.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/bddfe52f31fe3ab796ca0daba3503e74/difugim.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a939c4022---jafususeratukator.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/dodesubovima.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/84961042952.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865b1e4ce76---8476548493.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e8fd0a69---soxibimuxitis.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/wokudanitejanunuk.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210704210635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=aviation+weather+4th+edition+pdf+freePDF 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_off0000c2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A4 10592 bytes
SHA-256: c501051560755343a2891dcf0d5c92157651d3e11e838d35aa9abd30ee80532f
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 16452 bytes
SHA-256: 3d964fbf9771cafcac929ac0c7dcd68553c6c82c7151f20d9ccdcde9491164a5
font_02_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1