Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f25c8e5a573b3c1…

MALICIOUS

PDF

72.1 KB Created: 2021-08-02 11:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b41afdda180d8118b6d170a5ac91929 SHA-1: e30ea6263aa29f26cf04a3abd2873c51e7123502 SHA-256: 9f25c8e5a573b3c1244945e1253b9613a5f59f54854952bfcc1c7a1a0a785bf0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, with numerous embedded URLs pointing to websites hosted on compromised CMS upload storage. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8058

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5cab01f49de4644ccdbd2ebd289fffd5/xipaduvuwetejigazogupur.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/14790282961.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/50778199602.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/gofasanawutuvogumamusifir.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1c0315e0---kosevuxebigerofemobofipo.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/29952461889.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/83321015058.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b8rkgmjc2q2tr20vd2u1sfpa4q/dixamezoxuvajodeje.pdfIn PDF document text
    • https://cargobull.cz/res/file/10735630703.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/81785331556.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160728957da13e---salikani.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/26827459056.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/tizudatirolutizekev.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/31378541237.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9a8d249e---tomerajezufelo.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/razetagikerazejiroguxi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcdb8bb3dc---bofinonuritu.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/fixesogutos.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d0ib0jd8o60gnun0v7iqhpudf9/40506391423.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/vitujikeromawejukeru.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kuh0mldmr7fvksoovmlid2vmpm/sedololijekoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cd+size+template+wordPDF link annotation
    • 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_off0000c415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 10628 bytes
SHA-256: 41f34256758ff5766b24a401ca464c901bdec740b537a1fbe35e92f76d77a611
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 16444 bytes
SHA-256: ccb02145e3b075cec7e9782073030906a9a5ca75876183c4f0afd4cce4e0ce0e