Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab50948b17b3cad…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 21:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6697068130fdb9d56f43b63a8abb699e SHA-1: db88f0c2443ba1ffe2f3f652178757e6da292b93 SHA-256: cab50948b17b3cadfc892f1fc018be3b0bc0148032b8558c55b77ca64063f852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution are consistent with a campaign to drive traffic to malicious sites, potentially for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://phaptangpgvn.net/app/webroot/upload/files/50529738889.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/fezipagokez.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/88990784267.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/sosedibakejarifuruv.pdfIn PDF document text
    • http://lulanjina.net/upload/files/28302447978.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/wogagukejiwitozup.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/zupekeg.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ee99bef8---fozakigewudu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/kowenurawurolifusos.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gapigenebedegirirerogar.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/rewuziweko.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/51849197238.pdfIn PDF document text
    • http://momsystem.ru/public/file/62578714318.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a1bdf4763e7ffb8f9f8e1048c4c062aa/dotubudikebizadutisixo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b1f913c7c---tilelap.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc3e63783c---putakato.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/jobulujo.pdfIn PDF document text
    • http://soupworld.de/upload/file/wupejojunopupubu.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wutoxotivezokefuguraram.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/fepovegod.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/875f0a44b5f11212a9f98ab8c0100487/17902266284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rsmeans+building+construction+cost+data+2009+pdfPDF 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_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 11656 bytes
SHA-256: 91a0847a1f57352fb4ca852e3432a7e223c694670f9d0e0cd740b776291299e1
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16788 bytes
SHA-256: b85d802aef272e38b045830260eed28ef96baffe4f6a3df912b19bfccad3833b
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1