Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5a86351d0d8310…

MALICIOUS

PDF

68.5 KB Created: 2021-05-10 19:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90c745a338ef2f2979ab62c73a4bb7fb SHA-1: 5baa0dd6d04d2bf5ecdb05e6a1e41f295938e617 SHA-256: be5a86351d0d8310a047c4a1eb498444a14daeae562a453e3975d2dfa52a7d90
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7593

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795fe105a7b---gugosama.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b93b06b2af27e61d3a9842a597ec18cc/mazirapinivinakapobemuzu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbec913e5---zejigowetaraxivole.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a258c1d496b874bb8d5bde0e6e9ddb73/8181443039.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b486362319---raxufafenepajugolito.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xagupelora.pdf
    • http://beerskiboot.com/img/upload/file/rubodizaxofariremodoge.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/90013aa964a05eeac759686a4541bfa0/45893833010.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/db6ebface3c85da0f8d90e9c9ca730e3/vovotomemukajipeluvuviw.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d8f747e042870570e1804716be9b73b1/xujok.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6cd7483e---vagutinibevop.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/64034260d71de331dd155b253ace8eca/39760030427.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3da9b426---zeguxikodugif.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6fd1632b---jiletuxefifukifabal.pdf
    • http://agnieszkapawlik.com/userfiles/file/zuwejupub.pdf
    • http://ghalemdi.com/userfiles/file/zoxekijexun.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab6457d45---23371177504.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc804f1f70---fesogadewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=la+chargers+final+injury+report
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d514.bin
c4e16a8d35551a9728c4db890d45cbb4cb1920f6a01a5d68fd7c78b180b21f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 5396 bytes
font_01_sfnt_off0000e77f.bin
4ee1270766e614aed8a2688018646ea670bbc2e4a084bf1b4e254ca7e82f3f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10944 bytes

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