Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8fb400eebe3169…

MALICIOUS

PDF

76.9 KB Created: 2021-06-26 04:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65ac8d00866e0308d9baf91e22e87b27 SHA-1: 8f166fb8947d34583ceedbbd1bb9b6f3441c2406 SHA-256: 8c8fb400eebe3169ac0f8cef27285cdcc59752cd545b4e96616e84bcc8b26f01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=towson+track+and+field
    • http://fsoa.cn/userfiles/file/tipizukaw.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/de7c7069921473f817965f0e27226887/remidebotenux.pdf
    • http://pivotal-technologies.com/userfiles/file/nogibenur.pdf
    • http://nowyhotelik.pl/userfiles/file/tupozadejiwibo.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1460b831e8---73524853145.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a060f8499ba---60569594197.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/be771e6a7e0431127a76113b4583e781/88909479174.pdf
    • http://dienmaythanglong.org/uploads/files/voteka.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa8462f8d---mazelatejo.pdf
    • http://kameleonhastanc.hu/files/file/zelulogixagusogenokesano.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f6d631d83cfa87ad7509a09f74460ba2/97829272990.pdf
    • http://pokewaveanaheim.com/uploads/files/tisoralajafumugufajexodu.pdf
    • http://toyotalongbien.org/data/dulieu/files/69515620014.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd80c58937---kejeme.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3ff27ee62d684e9a4df19f156764aae9/30253580412.pdf
    • http://cokhibaosang.com/media/ftp/file/18339312221.pdf
    • http://bearings-home.com/userfiles/file/20445537315.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160919b1f0d1c3---mufuditud.pdf
    • http://malbreil.com/userfiles/file/manalixufileb.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5f6c2437---93600531427.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee47e42e1---80665196392.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ofrdsb6no8ks7uci3b8ljjeu0d/80729006442.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c856.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 16792 bytes
font_01_sfnt_off0000e06d.bin
32f7f96cc3965236049d5d9a666b090fe0f703fead96e10422e7c3dc2dceff15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 10608 bytes
font_02_sfnt_off0000f8e6.bin
9c601d8d90562b6de43eea0d22edf85f5d37cc75d9d1cfa8a0d75b544a67e99a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 17584 bytes