Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6375a87fdcb9471…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 03:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a75e171a8faf949557e457aaec10479 SHA-1: 478babe599908def291b770c7ea2a70d854a7772 SHA-256: b6375a87fdcb94719a36ed1b9539ede334d8b1d65df1084fa0c94261046eadc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are flagged as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://betheaskssd.com/flash/betheaskssd.com/file/jiziferibigenanu.pdf
    • https://sopkambing.com/contents/files/tukaxaguxuluvawazuvurar.pdf
    • http://hotelbasantresidency.com/uploads/verataligenegugap.pdf
    • http://h-st.nl/bestanden/files/vebubivopigetuwokuzer.pdf
    • http://akademibt.com/resimler/files/91376742133.pdf
    • http://viettruss.com/upload/file/fuzuwajerunomipojupaj.pdf
    • http://dlastudenta.org/Upload/file/93495479657.pdf
    • https://fsbulletsandbrass.com/userfiles/files/69267160796.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/jijulamiraxugug.pdf
    • https://nyig.com/files/file/68260089743.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/88a90e951b0f996263f9394b51db4d6c/45441684752.pdf
    • http://nasfthr.com/userfiles/file/19900794452.pdf
    • https://threadworx.com/thread/admin/uploads/file/65055291066.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/satedavojaxidob.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fee77495b69347efaa44dce17a3b026c/57620621308.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/44b913af5ae14595668985ba91c6c070/17042165535.pdf
    • http://hmondo.com/userData/board/file/radojonixeludixokinupon.pdf
    • http://inarchengineering.it/userfiles/files/60965354001.pdf
    • http://pincesorvarshop.hu/editor_up/xipidalobamisapidod.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8f8e43e21a298c393554a04c51032b9f/83400577529.pdf
    • https://doxity.ro/ckfinder/userfiles/files/suzez.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c340e9bfa96c51867b380b61ed8cb884/dodojusufuserugipolidulo.pdf
    • http://1-cities.com/blog_images/blog_/file/rezuju.pdf
    • https://asken.as/bilder/file/55830663386.pdf
    • http://stark-tools.ru/images/uploaded/11127322914.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/padavinumusix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=boruto+episode+62+english+dub
    • 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_off0000d434.bin
6e515236230f6d428bfb584951fdb2486f3f8be9df159809822cc46f3c144eaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 19308 bytes
font_01_sfnt_off000106b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
font_02_sfnt_off00011eca.bin
9f22c8c4e3829d8348969b51bf016a2e5f6988f2fbea21eff53fc3e3551eae0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 11088 bytes