Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a197fbde3abc56…

MALICIOUS

PDF

78.7 KB Created: 2021-08-02 16:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40aeda0aa9508ff374c8e979df5df46b SHA-1: 490a968eaa908d817ab6d1bbd7d8f7c3ad686ec7 SHA-256: f8a197fbde3abc56c3468e50cc86d31e8d0e35e472ba3acd9aced3cffe08bc3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://coluer.ir/documents/file/28755980240.pdf In PDF document text
    • http://islandpointfl.com/userimages/52641770797.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/radipibitoje.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a283b191---35496893998.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/dudekagalalomuwij.pdfIn PDF document text
    • http://limoride.net/gallery/file/93491817497.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8hvg2cfsn8ia4gnbmevuhd53b5/nagadowo.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/13878672731.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/gusej.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0e05d4d91554eb9cea0f8b0dcea3fdc9/65743136584.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/89821876525.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5d4d06cb9355c41865446894932c146c/13077332164.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e59c4b18---81886213650.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/pabixekiremevepidubokowu.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/98235412062.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/57348900244.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/nuwal.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/xubowesinamaxikagexil.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/61690322671.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/zabonigafela.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/16300169073.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/73t421cck9n0d3ni4juilssfc3/zejafadixiru.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210623_C05A688B372774CF.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/vudizovexigeva.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/nekorukanox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reset+a+jeep+radioPDF 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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 16044 bytes
SHA-256: 349fca34559643e91769ad3b792e30091562371936db3f68a71276f40f40b045
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 10444 bytes
SHA-256: bc965272852da8846fc6d7eecc08ac83369bcc91ea59e2a145e663b91bab1629