Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09f765777e4a33f…

MALICIOUS

PDF

72.2 KB Created: 2021-06-22 14:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0f3c20806ad836f90eb92828712b116e SHA-1: 6fcf20c0d6b0a8a6247aa4a3d5b2c5af810e98ab SHA-256: b09f765777e4a33f98e1bf5db7ab95672c5c41605380681307bc1dbc73ba1ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to deliver a secondary payload. The presence of embedded URLs and the heuristic firings related to link farms and compromised CMS uploads strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://aslimitada.com/userfiles/file/80730387277.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4853558103b9bab5d268c1ddaf26793e/62943857313.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bd126dc6e416233edb7a7bcc7d1dbba8/17553419336.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/20783889161.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/34595733088.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/364fbf9727b21199aebbebb77f5a2cc2/ganedowerekuterijeruvugob.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02438c3d0---36882873717.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/93910fdff8bf670fabe01e1a569644aa/raralav.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/685fbf65808d07a590db03877263d077/28599025351.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a47e342a---mezipekogosegibeko.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/79381323754.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/1676808037.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c080508ec8af659ec12222e3c1aad3b2/widirezag.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/69089042947.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/7186661959.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/75426915581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=value+scale+worksheet+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 5364 bytes
SHA-256: f8913df9e0e5dbdc17085dd80f0ecc8ee6b008866be842dbb3bc357ab02ef0e1
font_01_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 12496 bytes
SHA-256: 4f50448dd412f7c5bda9a9c4a5aca36a79de05f9b258d158664138754106b213