Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e3465fb725cd40…

MALICIOUS

PDF

80.0 KB Created: 2021-06-14 07:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b98e8a4c3e59efef6619c7d4277b2515 SHA-1: 9cb7b52c2b1bdb76fde9c906792a9f37db3712b4 SHA-256: 55e3465fb725cd40d71285fe1b29d8c7a37e1239fde1f88f8cf329c3d956af4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a URL with 'cod+modern+warfare+apk+download' in the utm_term parameter indicates a phishing lure to trick users into downloading a fake application. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=cod+modern+warfare+apk+download PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bbde1062a---vevosubig.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c3a04089333928a222cf763e86d102b7/wiwumovutixapatiwonepofo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a486f460---sumavajaxukukudokap.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/ruwizumujemiterumopezo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tunabajejine.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kidijokizuxifunatesudinox.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722fb272660---jorug.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5be5809dd---78535216200.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b779bc0791c---15110438688.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/421392ca0758b553d9b04e06ae8d6c01/lewisavajobolefa.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/14570036556.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/taxoros.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/zubisofagarukune.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/dijibewazu.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/boduzugulitafisinivawetat.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/nivasevudanakisezebivu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d82c2415d0---lirivewonu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9adf5bdf1abac314d536276df11a241c/bebaridibur.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/43004325723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 5072 bytes
SHA-256: 1f3607392e0e5a54e40d6912595253c88a02cda60a0480dc598a26c6068b41cd
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 22228 bytes
SHA-256: b853fbf6dd652a491854f932cb179be29753c2f90cbc45ff53186e17abfd6029