Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d3edfb1a369b87…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 03:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 204546c2730526ef8cb59cdd6ce8ab1b SHA-1: acf0f4f5d0f49f985c44812f2ef1b447ea13b1be SHA-256: 05d3edfb1a369b8712c08bc985b8980250b28554ac80d0237b99798f6ed06cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=snes9x+ex%2B+games+download PDF link annotation
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/tanefasokilenalamijemon.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/11821313057.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/vizadop.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/xebibirabogaxekanokij.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/36356039480.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/50046174540.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393a7ea61dd---niwofipazigerafipudakuxo.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/beliwodomilibidiwi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wexuderonofavikebaxevoroj.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/wipidadijiziz.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jovabozovipemijejer.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2c7af9d5e5ae9ce80a830a3ae98a2b45/63160313740.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/vaseliziruvumosipo.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/26045479989.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139418d1cfa8---31787264988.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/39032396626.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9fa159a500f958c6daca9d87309f49cf/xadusasipixoniribiberulav.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/39756952292.pdfIn PDF document text
    • https://onlinendttraining.com/files/vegalesipibazewara.pdfIn PDF document text
    • http://abc-tel.ru/data/File/dujofemoxupujep.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4e4268b4---xubakuzusuzoxel.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/terevezubapapuje.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/didulad.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/74038215352.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wotelisabinemifezodup.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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 18220 bytes
SHA-256: e678b3151df804ac688d0710e6e5f5c6221d747704c146737fa3ceea7541ac0c
font_02_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 10732 bytes
SHA-256: 50acf64e02c775200e4583ca1a32ff1019fcf35de1c48caaa40ca7dfc735c99b

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