Malicious PDF — malware analysis report

Static analysis result for SHA-256 f339513c1a442760…

MALICIOUS

PDF

74.9 KB Created: 2021-08-24 10:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec1297931b40459ff970f57ecc7ce38a SHA-1: 5b92b4c486ed5533923585caab5ce70b46f53029 SHA-256: f339513c1a442760319ac7552a55253bbec8bb8559ad038bbe2382263e339934
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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 https://wastran.ru/uplcv?utm_term=turnitin+class+id+and+enrollment+key+2020+active PDF link annotation
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d2eae44e379c9e8ad4e0731023c11d05/3847337138.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/xizupoxifap.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7f294e12ed240b9f47ecedbd0f48838e/37580418819.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/nabemelomakep.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/44623731920.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/21572365418.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/800dc36ef1a49af783ddcc8849568c32/34946306939.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/tuzaxetisorolejeze.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5aaff34---kafopoki.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/pisubox.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fbc3dbced18b53e56629ca0916c8881e/javabewo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/73109050859.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/42338607224.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609795412cfd6---norosawasekefiliwit.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/14935108243.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8dfb668a870277569a4aa5f463c45969/sevodavalitatepozonukafa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3fktijtrmqqbq2va42gcm6d995/75479679502.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0t8af5i6c3j7lajbqtdvoqo046/21558461840.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/39787f23ef95d6b0618ff8effdc6765d/pafireluwanelebezozunomoz.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/faed9dfc033ad06f9f343e7a61a376ab/79396459615.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/58337139832.pdfIn PDF document text
    • http://mrybalko.ru/files/posedavaju.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/5gsf6n4se1irkaricqrihb34j6/38248094191.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/t65ho560nda397efsc4kfijg5b/tuxor.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9ea7dc54e7afd20ce38fcc396d98c401/vipemasatarufubij.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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 15336 bytes
SHA-256: 380d0a8e96bd3012c0c0471f70f210aadbe476015aac5c39ac10306f48014628
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 11108 bytes
SHA-256: d9925ffab62e12e5fef3e4bc47e70bee00993c4a2437435ebba1d0d7cfb2505b