Malicious PDF — malware analysis report

Static analysis result for SHA-256 36df9ab44b49896b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 20:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb2f4ac27ffdcb702ffc5b6ed3b163b2 SHA-1: b257e51894fa8bc8f78eabdc31913633fd810a39 SHA-256: 36df9ab44b49896b047a2948df25628f9b6ebf36419595435422438be9a77dbb
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic firings suggest this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6300

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/42766fe6f96c4b1422467e5efe1e6cab/kunanedexadalinibijof.pdf In PDF document text
    • http://leaguengn.com/userfiles/file///7368815265.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30bf21c7a---vibeworubemoforatesufoko.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/radesexiladidefuvada.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/50312461345.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u4iqmds8hgrc9li4au4qj1l5d6/61962320048.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-12/20210812230036977986.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34682273857.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/kelanujafowotipigama.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/penuzakasogovezeruw.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/51551899680.pdfIn PDF document text
    • http://erpos.sk/data/files/larituxilulifotozoju.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fce271fbb5050eb05474ecd91aba91d8/xafewetorukufunafujefize.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/xinimipakegonubun.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608899c06a3de---3670886024.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609053b3a67fd---40209090651.pdfIn PDF document text
    • http://goref.ru/files/file/89512372448.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/xadupuse.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/fukubakobesabutaso.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/8be3e5d15cb4b91b78f4dc8355cfcf6d/zuzowogexo.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fewirowukowepejanijive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rig+veda+sandhyavandanam+in+english+pdfPDF 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_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 10852 bytes
SHA-256: 0091216dd0ac90260354b3ddcd0331ad614acd20907c1c5cbf00ac542782d210
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 17384 bytes
SHA-256: 4790a107384d124b5125711aaa776c2641ed5d678fa563103e6f1b2647417343
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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