Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b48e7285022d6e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 14:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7fcd57178c7600232a964567baf3d68 SHA-1: 1f7872559d4456790a498d463bb0d0209163f0cd SHA-256: 09b48e7285022d6ea4b68f4ed19a0c7af8626e648bc05e9b98d99e491dfc0329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=download+rfs+real+flight+simulator+mod+apk PDF link annotation
    • https://jjpremiers.com/files/felusas.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/luxatepixelagozowuve.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2aee8fc5b---rifibajewomoj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134addf37613---60364192571.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/1823720982.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_759982084372584B.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/fowinikakaz.pdfIn PDF document text
    • http://novichiha.ru/pic/file/menowew.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/83672862307.pdfIn PDF document text
    • http://toroisg.com/public/images/files/90587319639.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614088747301f---17368445316.pdfIn PDF document text
    • http://labsshop.com/d/files/dizitipazaruxuz.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/24132946293.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/rivow.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/xorikusoro.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109021241288165.pdfIn PDF document text
    • http://agilesolutions.in/uploads/96862938500.pdfIn PDF document text
    • http://besteva.com/upload/files/92461371252.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/dutatemoxumod.pdfIn PDF document text
    • http://attlas.center/userfiles/file/54441676551.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/luwazizep.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/xikifijeju.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/wupujufokorobeduja.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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 16408 bytes
SHA-256: 62f7f3cc992e2d885542b4165514688f7705d08474516138c6861dbdcb9ff60c
font_02_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 11224 bytes
SHA-256: d64c7e7e1f1e852968460be5c01d4dfab4fb41a4ccbc075336db3a7a409106bf