Malicious PDF — malware analysis report

Static analysis result for SHA-256 680c89fdfc82586b…

MALICIOUS

PDF

63.6 KB Created: 2021-09-07 01:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac99b016e9d656dea442575091048c08 SHA-1: 056674e1d31e416393453f463b6430c1a081816d SHA-256: 680c89fdfc82586b4d010aa7585e05da001f4d0778c4cfbcb0e79266aa2269ed
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting the document is designed to host or redirect to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf005dc35e---sigokewumanamakaxexofag.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ba280b160e0f11ef9c48714d93f1525a/70171756280.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9cd8367e---34916829653.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/64973a5db6c2a09369fdc03075204e95/20492367104.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/zivawegoxepoz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7cf4cdcb1deb956ac2d0145252e815c2/23568071725.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/euid5n38ip0k570r633458bo30/76121903936.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58fa2fef7---likisulalejazeketam.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/sh0ec9acejmulg6kunt7e8po9d/kogefoxiwekukuz.pdfIn PDF document text
    • http://saktigroup.in/uploads/mapexunojibaron.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/66813506199.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/xumapubomi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c272c4a068---xezigapokobesexevabegaxem.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/riwavamexojegunikip.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/muvofokotepa.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/dekobemiwezorasenewigewa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aegumkh2gcvc41o4ia0ej6cjp2/vegagukivujupamibega.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/15016449719.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/43414781353.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c48e0e1afc99fd5a98a5bf0a08e8c0e3/sijapamirewexosikur.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/fizasivexorufekagozoweje.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ac88fc12---kuzifabudumaziralafoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=enolmaster+vacuum+bottle+filler+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 14636 bytes
SHA-256: 02a78a6078d29b7688c353a03427b422e12c0306f33c6ebde0595ba45193a4bd