Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb40227c10f0b2d0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 02:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2c1c67f0d6d8eae7a33f4c9dedfa10a SHA-1: 3f238773ae4f9128f573ad2f9c780ad4377b7c63 SHA-256: cb40227c10f0b2d066a32c2f0046cc09504eac862169b1423cd4f61fa518cba6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pokeocncafe.com/uploads/files/poxeramu.pdf In PDF document text
    • https://eletvital.hu/uploads/files/mevegotik.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a57be0c8009---nusigofiwotosiroxixawed.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/giteti.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/73810293834.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c05c5af32---dujevafixi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/22c64d7d6d5fc760c974b4fa230ac763/95424452885.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dd3a3af31571fff05c4ea3ff6131dcb9/rimibizufevevi.pdfIn PDF document text
    • http://orderkai.com/uploads/files/manipegumitevanajo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f7d0302c8b623dcd4ecf2861e41d22c0/lebukuluve.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bawodiwowunavewow.pdfIn PDF document text
    • https://kuepancong.com/contents//files/92658817862.pdfIn PDF document text
    • https://yifff.se/userfiles/file/zivabukajexulunidura.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/35675310646.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7e691355c---12144879293.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/54338193673.pdfIn PDF document text
    • https://5uempat.com/contents/files/janefidurezaxoludezapexe.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dda123102---zafobokutalekukumafan.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/42626462187.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/49432161341.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/207c90f18a4c730fed231a92fd992d06/fapanap.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/92302188657.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rv64jkbhs4p47vd8i8uklrsg8o/23769313155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=managerial+communication+textbook+pdfPDF 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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 11220 bytes
SHA-256: f8332c8d9c0d2293a75da3d402aa2c0011eba64e1433e3e9db663a2d138a4467
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 17600 bytes
SHA-256: b5ea4a5de7251a3794943af83bc86f303bd9278c20c5d0b24b5ceb74b77c529a
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1