Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9dca94774128293…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 12:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: daefa16f7dd384b261e3d5eff3d90168 SHA-1: 97e3a24c56790c835a629285d2868e869d3394de SHA-256: f9dca94774128293de6fdf68f06410033b4b48b52e1009bb10a0eadf0238aa35
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage or disposable hosting. The primary function appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics.

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://tekartltd.com/upload/files/12870904893.pdf In PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-21-02-07-05-98.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/u13an10fv35pr68fgsbc8lrqk9/62645253383.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/32813628816.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/petisugad.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/detomopuditavuwiweguk.pdfIn PDF document text
    • https://rajakedua.com/contents/files/levimepujedageli.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/47023590692.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2f07e6aa4---23796800432.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/pabavuwawudowipoliwuxegom.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/58458854027.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/47213644435.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/davejaziduwobewulukul.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/97873653299.pdfIn PDF document text
    • http://lactopad.com/uploads/files/titasugurobelozuf.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hbsm0k82bs3n69klss20o0q014/bigiragigulosorakob.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613421db73b86---76930258209.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/nizanenoxitopu.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/tifamavixil.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/pokudisijadubaledenunupo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614299067ff7c---88253456709.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/445b5ee270da88044471731d5306ff93/vamusototimijikeli.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/bomanotuwidonafaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=clear+site+data+chrome+androidPDF 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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 17268 bytes
SHA-256: 5beb598cd1b3ec6064ff3386c7882f99ddc59f990a2e6d9056129b790a95b7ba
font_01_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10668 bytes
SHA-256: 23010feee4be702456c05d67ca1bc68fbba7c7e5cf103d3ec410a88f5861133b

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