Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef258d0f9a97d00c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 03:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29ddd5f1184eccc7b670e000e9c01d4b SHA-1: be4d88e166b38a67c40b421a862017976f459287 SHA-256: ef258d0f9a97d00c06164a79352d58b3631de955f5b4a798bade62e01faa9ca8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. The presence of these links suggests the document is designed to redirect users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d13baac1---widofokaduxanurewuli.pdf In PDF document text
    • http://smalternatywa.pl/media/upload/files/671aa0e1a809618587652fb5c7a010e3.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/55317067799.pdfIn PDF document text
    • http://i-dron.cz/data/file/dolilufinonufim.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/23352383191.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///nulajupolavazixefe.pdfIn PDF document text
    • http://ore-processing.ru/d/files/bitiwan.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16143244e92e0e---5628879197.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/97855140230.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142537e803c5---19430779870.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5ae30be67f69d98cff110559feac9d34/55706846493.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/nojawulaxokebime.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403381e2da---revorawi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105a797234---jizebinefolebumixidak.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/bononivagoxesaxuwu.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/borazirulonu.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/51519952968.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/poravakurefir.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gadutesawuzutudajepil.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210914_78D3ACF0874A736B.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614288f48bebb---77735213591.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/megabazogezivedebegupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+system+driving+appPDF 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_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 17848 bytes
SHA-256: a373765ff9e4ff3067e501617d97a439bbf21d12338285b600162edddcee574d
font_01_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 10848 bytes
SHA-256: 39c30fd25d3c31fa2e0a49330aa46c11f9b03075d42d9b4df68baac6a610502e
font_02_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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