Malicious PDF — malware analysis report

Static analysis result for SHA-256 993e8b120a27eabe…

MALICIOUS

PDF

62.5 KB Created: 2021-05-29 14:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef4f022a8c05bd1da3847841323a9d2f SHA-1: 15b9c74023c9cf810ba493824a709cc0a84b5b8a SHA-256: 993e8b120a27eabe3cbfdf337652db7efbe4d5c6aa94c7a16ebb613a440fae23
154 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs pointing to compromised WordPress upload directories and other suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'mcps desktop portal login', suggesting a lure for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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://synerhu.ru/uplcv?utm_term=mcps+desktop+portal+login
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608476466d4c2---dafuvugawigorozuwuj.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/453f1ac76b04b1b741287a605a035e39/81565530034.pdf
    • https://gannat-ltd.com/userfiles/file/64529732019.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3eaabaa5f---vawixonobifobekekezeg.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a360e4c9c42---21644067167.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6d1cc4b10fcd4ad82776f2c0d1a41d8d/bobanusotakunukuwitezuba.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dbd36d4b9240d6f395d6cb6f6ba6a7a7/tidexanejifavugifim.pdf
    • http://allprintusa.com/admin/images/file/7374121315.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b13d276c2c7---36695388222.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d3bab028---14320206537.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9af92be07dad23cf4184e9b4616044da/36901509776.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b03ef5f6d455153f9b7acc372ddea6f8/35509655250.pdf
    • http://forter.vn/hinhanh/file/berelo.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0239f3365ae2381ea878a342152d306e/49934693320.pdf
    • http://anaminfo.com/attachfile/file/xawesomarizezup.pdf
    • http://airconbank.com/upload/fckeditor/file/20001806262.pdf
    • http://crmrealty360degree.in/userfiles/file/79404996381.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbd.bin
d739eb464ec3fcb94eb353b61420a117ad8f6dc353249e5a10b772b34dc0dfce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 5308 bytes

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