Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7713e67d3b982f0…

MALICIOUS

PDF

70.7 KB Created: 2021-08-04 15:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 213a97dec904bada88819a936d94e1ac SHA-1: e865359134e61068f0b5bbbef80c07874b7a10d6 SHA-256: b7713e67d3b982f036239cdcf48856c2d64e1b2a8142b6fa102523be3c7d5f9b
154 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 WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8520

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 https://aihr-iadh.org/uploads/FCK_files/file/gaxopi.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a97acda2---niguvafevi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5c343qf5hn03t1io89gr59e3dq/womizusazixigonawuko.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/5912382670.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/bodokivakapa.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/livutape.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/60277810409.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/pepuragobijigamufatixe.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/butokakamonedom.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609650a5b84b8---32535546640.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/575125e3fcbfff2c717049440eeb45ba/juxuvuga.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/94342378310.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9be4cfc632ca732e1577b3b253ee8a2a/60514312430.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/lunuridalozorak.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/182652398c8c4bf20886e235c90f3adc/14684158005.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/vuvaganivediv.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/cf5dbaa7c28fde49449c630869ebc6bb/4037340443.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5r84b2n9pa0dfprg6vmobaivl7/jupeninovaga.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8be56f80---28707439930.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vexurudafanavolo.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/97959797112.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/39312672945.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7a6b7d64---25043404629.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210709030023.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e40f747ea5c24bfab94fb948f885555f/fubizikef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=adding+fractions+with+unlike+denominators+worksheets+pdf+grade+4PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16460 bytes
SHA-256: 409cb8c2635250cd33da46eb5e6fd88a38f5321dfcbbae0e440955fc24851eef