Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8850e8b750b8c4…

MALICIOUS

PDF

94.1 KB Created: 2021-08-10 03:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f03774e9d9f13f419413e87fb3afb3df SHA-1: c047980363ad8c4e8f758f18b11a806a7277fdc1 SHA-256: 3a8850e8b750b8c4480c65adec4fd1410acb9f78731902bde465e39abd1aa239
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071abb628d9f---lesexos.pdf In PDF document text
    • http://visusmarble.com/images_upload/files/wanenajiwufawisuzimozogof.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/mesolimusasiriruzezopimu.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/21376870911.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///56460450496.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/tevesesenozabelize.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/wediwinulobagijipili.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/79789085865.pdfIn PDF document text
    • https://tmtteks.com/files/42901855698.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/m9t89vqris5geako2lc9hs2sik/xiwinuladak.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085db0e05c8e---57041079655.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732fe17ef6---posiwajozenakamujakowi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3bf2519d---94140881327.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/8598521243.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/06c6587aa76c78a6e5078b2c658de91b/kewotox.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/39330053289.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/36606885367.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/zareguperi.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/57323738471.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/956fe3dee9830943a9e3884ec7e74149/66828129076.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/98666762140.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/83b2d8b45cfde3c0bedf92dc89a9b62d/9547110755.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/85782270066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+bake+makeup+black+girlPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16372 bytes
SHA-256: d967ff0d244d4c4447f2ce6582f696d79354395068513e193762d8f6555fdd6d
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 17940 bytes
SHA-256: c2db3e4f346c5d8545fa75cccf143853a07d9f2e5ee5341cfc187e3113a6791a
font_02_sfnt_off00013987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001519e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519E 10856 bytes
SHA-256: 2adc07af9fa411b39e88cb2851b404c79a8b2acc7defdc06d77dab094140d42e

Open this report in the interactive analyzer, or submit your own file for analysis.