Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf55f4ef8c06508c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 04:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 982fc58e2754c7bb0a6243a87655e67b SHA-1: 286ceb43611dd339ac8e96d439853989800236de SHA-256: bf55f4ef8c06508c62360c36440be912afa04ec9f3cc5e17d6c17cc5181dbae2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of a link farm on compromised infrastructure suggests an attempt to obscure the true destination and leverage potentially trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8512

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ed17f569---xilakujulemofiso.pdf In PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/kajidug.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16105d588f00b3---84736727578.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbd2ee149---97936549730.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jabudadadajojigag.pdfIn PDF document text
    • https://avela.md/userfiles/file/lirakixotajuxefebujar.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f804980944f---tinapubozisefisikorova.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/naripurifawenoji.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/86ef74915117eee41cf8cd14b7564877/kufinawimiwowure.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/26c5775b9115cbce28d8350656655049/jiporivivesinerapigavefa.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/93541742785.pdfIn PDF document text
    • http://web68s.com/upload/files/72491609503.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fa0450e48---51836426667.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b971e22b94c---fegeni.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7504c1c9a36a742cf4e1f1549e9322c9/2309530822.pdfIn PDF document text
    • https://harom.ro/files/file/6283458886.pdfIn PDF document text
    • https://highrise.pl/file/97173515187.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0063619436b0abc4176d1346c69a940f/39704793245.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/mowoxugoxolezojuwolapif.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0652be71d79c52f233dcdc027d8b0b91/monubad.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161255ab08f6db---zidul.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/39f3497d2e3a9fff1c46d5a4ffaf1366/17480314232.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fcf66j2lasb2omnf1c38aoh148/tobogox.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/zumivomakozoduroxakuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=8th+grade+english+worksheets+with+answer+key+pdfPDF 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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 11180 bytes
SHA-256: b37ff102499126f71962ff2c3fff04fe334668ca4ffe62c1a53810138f3b811b