Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafdb0ecfe364d75…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 16:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b732bfd673da99bc9b14f483711c08d2 SHA-1: 126ac4bcf624cd0e1d180453e9a8ff8bb01e7d93 SHA-256: fafdb0ecfe364d7537766c09d9807e53413fc2576540c1f51b3ceecd176aa4b5
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many external URIs pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://tresonance.org/uploadfiles/gemato.pdf In PDF document text
    • https://sambelteri.com/contents/files/26667475906.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/64805842715.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/65728999230.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/58976263326.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/pabakujixopufunozox.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t3d54u5m41imm8v703kp60enth/2686667930.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xusemujizixosiki.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/vovinukiwuke.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/didilogitepexu.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210911_115054.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/72568114438.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/savegofiwimolejugu.pdfIn PDF document text
    • https://somogyplusz.hu/files/54313620413.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/31579631538.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/66534545292.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/gimitutujosijolag.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1b3304f3---tazoxutenufo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/56808066066.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/1536588372.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/muxosabefi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/179c814d216266ed5fda097acf2f72a3/melokare.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/35649454763.pdfIn PDF document text
    • https://badoza.net/userfiles/file/nubulib.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/tepetixa.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/rilamuridoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+world+hardest+game+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_off0000b25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 14632 bytes
SHA-256: f9ce2b55c15a27b5563c87c2d9f96551d60506e6e1fb6e969001a7e65f0fb46e
font_01_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 10720 bytes
SHA-256: bbeb974c75cb6e51d040f79488982c41b6b2189bee4f7f3f9b8dc592ee418819
font_02_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1