Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53e3a63af8cc01a…

MALICIOUS

PDF

69.2 KB Created: 2021-06-21 16:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 251f4296944a8736e24202f4462abdc0 SHA-1: 0084536d66edc68e0add01e7b96d63beb94e1836 SHA-256: f53e3a63af8cc01a6bbce81be15b9c8cc441ac5358b8a89203a53bf0ef4a2209
154 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'grade 11 trig identities worksheet'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://krisoc.ru/uplcv?utm_term=grade+11+trig+identities+worksheet
    • https://klcmekatronik.com/ckfinder/userfiles/files/goxavobi.pdf
    • https://amatnieks.com/pictures/image/zagopigebilib.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/damigazodomojokawedox.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a567f90e16a---kazotomuxizugadatin.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/7bf76c44b5b296ff1a4b20764c361eb2/gunivafinamexevikizoxe.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/suxafafumok.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l9gknogl1r3ltts4ma4pufmu9e/72797024659.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec34a959---20969211351.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7da14e71jh1skhvrr65p6esg09/81349884370.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ddd69023a0a0a8ba91aee214ac49b34a/vuwiwizedopetubebek.pdf
    • https://avela.md/userfiles/file/70429601213.pdf
    • https://celebicatering.com/upload/ckfinder/files/folifasugilon.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606d012691b49---gizimulopuw.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608504a08d881---ruganogi.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/87a38baf7a7fff42bf3cd6727b2425f5/16374966034.pdf
    • http://dtpokebar.com/uploads/files/wazimavetajabidamuwulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90e.bin
3cc943f964bfa97dc0e3e4e6f899cbc552882fe7ef7de86fb84efee381fac3dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 5292 bytes
font_01_sfnt_off0000eb21.bin
941e75a92bc032b83abc2d86a900a154b97d108d7d55ca7856d26228188e9f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 13068 bytes

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