Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ff07b435115029…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 08:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aaa5e5a826f6b1c57368064ad71f7ed3 SHA-1: f10cdf9a7d92242845060349e857bab0468231c7 SHA-256: 92ff07b435115029cdb564b571091fdf7999d15bcffdc4d3a2ee89aae892d6d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and embedded URLs suggest the document is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=stick+pool+club+mod+apk+unlimited+money+download PDF link annotation
    • http://novena99.com/uploads/files/202109080452559609.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/sijaxokojudutorajevari.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/mowisejebivop.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c3e04131---11617748143.pdfIn PDF document text
    • https://rajakedua.com/contents/files/lasuv.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/61088511380.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/11854952890.pdfIn PDF document text
    • http://sergeybazarov.ru/file/73914930001.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/17338249144.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/22508214413.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pimow.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/gusuvituz.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/98151839185.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/37766004809.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sigasenopuloro.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/najejizu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0hdev2cl8thfo8r4vhl0rfvc4b/68971147867.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c8f01083d1---sikaneravuvosikajabaf.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/suvonetesojukuwuga.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/64899649227.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zimilaluxuvefoxizamedos.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xozewonapilusofafuvido.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/16908951697.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/61603105632.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_off0000bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 11012 bytes
SHA-256: af8d0ba9a04a2327aca64150fb5a9a6bfd532257d3b7b2bed05e7f26c563fe0f
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16224 bytes
SHA-256: 0f0ad5f21f3b7a6d4443fa6cff6448494becc3e8b7ccc5b781421c7bd4177a06
font_02_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1