Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c57d658bfa71781…

MALICIOUS

PDF

66.5 KB Created: 2021-09-07 18:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b9b0e78d9d71427f89eaf4d337a705f SHA-1: 07572e9b7dac2c1841f5494f68244dac1f09e3df SHA-256: 3c57d658bfa71781fae96a09728bae25301cca88e18ae4c0aa2e4d4e21e2090d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=loom+knitting+pattern+book+pdf PDF link annotation
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/21323905099.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/64efc9867d5f41bc0f9c780c88e5d067/53889519889.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed6ea8542f---wegexedudofubemugogek.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/866a6bca080edc3ab7d7c9ed40cc5a9c/58444806081.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/51536507634.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/jefapopexuminatufani.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/22452506245.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/56324077783.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/660263066cb8b7215d3f6c0136badd74/tadalatifamore.pdfIn PDF document text
    • https://parc-hotel.info/file/75561519490.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/vawazixivokoxaremovibavi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g2i6vprgucl08hqeup3nfgjtj6/wabodizaxesasaku.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/21317072409.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86066a5d2---95555275277.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/xifitidojixanizexabefofo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160878e82374e2---69718446081.pdfIn PDF document text
    • http://soc-in.com/data/media/files/30130007594.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70150dcaf4---jedib.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609771ce75ff7---gukorofumotefomonexuluf.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/63807757942.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42cef2b96---nedukin.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/60610753578.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 10816 bytes
SHA-256: 90f67c9d7087cd0d229c9106c0acade3624228a86650c42f49724915be225343

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