Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a1a221ad22305a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 21:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65814bb856b6055e590d3ba9d11234f0 SHA-1: cb290ca9f24d84f31558f424656f27f73ca82ee5 SHA-256: 11a1a221ad22305a607eefd3d2db811eb75f1f3bc6b661696644912539d0a777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://miet-boot.ch/images/uploadedimages/file/22003128739.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cb04c34ddcc1905c42471ec2bf35aac/ruwokavobukasolon.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/342567.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5fa209db75322ee0f5a521f79bb7993b/17155810903.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210906_26DA659122065C55.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/94719655813.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/rawumokususuro.pdfIn PDF document text
    • https://labelmarket.pl/data/file/23920658365.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/45847721433.pdfIn PDF document text
    • https://fond.ru/userfiles/file/70030973876.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/torigoxekaxuwaz.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/53743683869.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/73b83e6215583702f8946f5b1adeea1e/94304381444.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_120348.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/78059031967.pdfIn PDF document text
    • https://o-dance.com/upload/files/zuwajezugejepo.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7shdhqa9eqnu3a29s5o02nv765/93699829003.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/10544063354.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334a89b197---rebeka.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/68594699744.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/gasowamonitimi.pdfIn PDF document text
    • https://epiphanych.com/images/file/bezexapanux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=watch+spiderman+3+online+freePDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 17876 bytes
SHA-256: c0c18775363dae32cac42e1c53a9e240d9e0fe0c2e3e5330c7769aa04513f84d
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 11048 bytes
SHA-256: 1d4bc1ac149f013a03616218bba5dd3767b2995b22328187c929b061e7608f2b