Malicious PDF — malware analysis report

Static analysis result for SHA-256 22774e0492a8626d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 18:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60858c1ae48eeacb8102eddb29c1b570 SHA-1: ef27e57e4ad6d504a5dfdcdea8a687e91f950551 SHA-256: 22774e0492a8626d0cae0a57340e4c7f41da10668d480e4c37011841b3d49c78
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and the use of formcraft/super-forms plugin upload directories suggest a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607816acbefd8---rimebomozowu.pdf In PDF document text
    • https://nmg.lv/img/uploads/files/82774307883.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e280cbf12f---zigefoxotibamojigofesilub.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079388b9e30f---koxubixutu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3fddc64312c32dfb725b8b4a4eaccadd/rejoxurofirubozipu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/808eb7f1227f38a3a7c38293606928f4/podimagativuzef.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/j059ffr89ohnv21d4fm2ktb9u7/70481760613.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/brutmcucdh78luokioila1bofj/mopivelafozamux.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rri1a58lupdhl9plhft36jlcqf/jixixosoroka.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/19645560888.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/80160985758.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6750d0ec547f31422efe2ad4ce15c2e5/81006486633.pdfIn PDF document text
    • http://gdaniec.com/upload/files/wewupebixademeziw.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/18990475279.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/fibazipapon.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/pooahs266vcvc1pfq48b2qbp53/36651303770.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/vuxusomuzuwoxu.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210701205831.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b93fb8c3d72---wotewijajasudujifesaxeze.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/39005001486.pdfIn PDF document text
    • http://waterreducer.cn/d/files/rufinikezexivufil.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/zaferizerukigibutoj.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9efe648ff---majifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+i+see+mars+tonightPDF 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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 16788 bytes
SHA-256: 264f4be2db10acc77fb72c57b2356206187bf4f37c9443fb5708fef5d9c278e2
font_01_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 10540 bytes
SHA-256: 299279228ba788aec7bb7c0445e54ce49b6df1f4651f6a750e6794685d3eb94e
font_02_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1