Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40f0c943a9d41bf…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3575b196f1879f2f6458ff99ae2f0667 SHA-1: 007a8dd86ae6f5f190bd0f0a467e4853f237dcfd SHA-256: f40f0c943a9d41bfb2b87d8112cece89fdef7fd473e462865618e4555922dd97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to numerous compromised WordPress upload sites and disposable hosting domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://irlanc.ru/uplcv?utm_term=call+unto+me+and+i+will+answer+you PDF link annotation
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0ce605e8---basedarijebilisurus.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/28088700008.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0105df180fed6616079ac8928078ecf4/vepinozunugu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nabivuned.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/lisurexesugokip.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/saduvidujalo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c9cbb47f5---kumeritefanotu.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/xasivavuzomegugepitexe.pdfIn PDF document text
    • https://strechybenesov.cz/content/94473432812.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082203d13c2d---fukivugekesazifapomati.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fddd4ac705---lazabaxul.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ivghc5297omfvqi1ftbleeais6/gosefev.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffae0ed1bf---walepamapavigo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/efeef90df4b631f08affa11df4e956f3/27900173232.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9a9e19ba---pubomuzotitalilot.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3ed74b0f2e2cd84c2a42b49327335fc7/judajanosidovix.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/regevufupibutis.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ff781c88369d90cc54edb995244d6472/14569684588.pdfIn PDF document text
    • http://alkimosgb.com/userfiles/files/limemirivikimozopelenuz.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/wedawijiginexobubuxofuto.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nkcs2etd47f02iksraes95uv3a/93154719885.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/vabalugusilajufa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8a16050169ad1ca8171473a76111c71f/disilirinenene.pdfIn PDF document text
    • 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_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 10740 bytes
SHA-256: 9cc30b369bce8345fc31752038a1f70cb6a53170846d93467a2f1c7269d51f43
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 17448 bytes
SHA-256: 07b963d19de47fa7d87d5609b1d4b12d4cec4d0533b29e9b53ff2106e27b178e

Open this report in the interactive analyzer, or submit your own file for analysis.