Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9683d88c732579a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 11:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e03d4c8f8836e4391990c07439db348 SHA-1: 7560bc59aa077fd9800839180b801ea01e1a5fa2 SHA-256: c9683d88c732579ad7c2b1af888db58678853f066d194bc540756bb65481ff6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It contains numerous embedded URLs pointing to other PDF files, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the overall structure strongly suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

Heuristics 5

  • 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
  • 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://studiomarcheluzzo.it/userfiles/files/95683707560.pdf In PDF document text
    • http://cutskytools.com/d/files/50521734600.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/12266966797.pdfIn PDF document text
    • http://195exim.com/datas/files/27819397339.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/79335265015.pdfIn PDF document text
    • https://mmtours.si/uploads/18002057055.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/93419656879.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/69279885217.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0127e46ddcac4fc541210aed06f203ed/2259626724.pdfIn PDF document text
    • https://digiconelectronics.com/media/76688639695.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/sapabavagirulolil.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/korizogorepogefojesaxoso.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347ce2ed2cd---wanutupamovok.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/59173500382.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/razadajulibojutekofufa.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/52128841759.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zokifusuwev.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/86622832077.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/danobejifebesaxovu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/48189247316.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cbb770e557425ee38d0dfff0309ed891/5392722924.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913112958078.pdfIn PDF document text
    • https://777mto.info/contents/files/4521729183.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/dafudotelunebiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=t95x+android+box+firmwarePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 18044 bytes
SHA-256: b976d679a2eabe9556b62c2734a9a9ca27efa5c5b3645a99acd6a0e441033bb6
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 10796 bytes
SHA-256: 7c7b63f20549f07017dd41c0a07b2fe0ad66df171ff30e5ebb85471c8718d980