Malicious PDF — malware analysis report

Static analysis result for SHA-256 849a5a5ab7b6ed9e…

MALICIOUS

PDF

273.6 KB Created: 2021-05-10 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9cee9a6d669994e40a406cd596b290b9 SHA-1: eaa57eaf455edf09e09f3f26314d23e918b746a7 SHA-256: 849a5a5ab7b6ed9ee40fc69e0058136b1c0f7a578d4d8d697cb6ca87b482e4e8
124 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates that these links are hosted on compromised upload storage, suggesting a tactic to obscure malicious destinations. The presence of these links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5954

Heuristics 4

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=bonding+test+chemistry+honors+answers PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a237d29ec1---fijiparovulotigawo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/80919052085.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jl48losiug6s4hoq1m7vvfbbg8/guxukekedika.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070947fa4cba---towupukawegijuxewob.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/sp0c4vmhj4gum0p9s6rh7mf7s1/fanakunaw.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/us2q7sn0ssr2ppo9ho0egds0bl/wovawukewomapuzemagot.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6no8cjq8652pbaffqngd20npe6/jisogiliwafosarofaxuve.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6497fc2c---zisexebisarolijo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/35bd4aa2ebb07feb74a01020f2a4e4e4/98396168962.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3a131ef597dcc3572a9937d6a5aeed9f/sebolesutiganuvo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb9460a03---murudisafumaxiguda.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8dcce792---wutufudusolibiragarilaba.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/j82ctg82n8nielvapcv8a6a137/xixitubutifojupuvenomu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160901b100383a---58106307779.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/is0jcsbsq19h3j893gejoqa9b7/sisobafosumepefegafibov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0004077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4077D 5564 bytes
SHA-256: b90b4f9cd18f120e43c10b559951cce4edb7b4928b6b42316473c4e478a59c45
font_01_sfnt_off00041a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41A5B 15232 bytes
SHA-256: 257c496a72a8cf4120264ce570b2e562eab2ebf8caff7e9e8c5cc6cee1f668f2

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