Malicious PDF — malware analysis report

Static analysis result for SHA-256 72316d93ee67ba87…

MALICIOUS

PDF

93.7 KB Created: 2021-07-23 09:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 92513cbdff740aa44567e36c17cf55da SHA-1: f986b7e40a166d07c34af0ceea515e122a1012ec SHA-256: 72316d93ee67ba87deb7916b52a7c1e4e9f6a70e03929b978aa9e7f17ebbdece
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4108

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ff3aff4c4dd6ce92153ba980306a5328/70437594258.pdf In PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9561bf957---jelarurimosogawudejig.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/35sk00upb27i3b3f9mp0adlof3/forosesofimeji.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/15076441917.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bcc9be99439b72702c674beb6c83ac8b/47378959863.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de03490e9ce---jupeberaduzuderiziba.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076a12c01545---15954043683.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6fov1j0c0ds0pngk85uvcs0avh/38264249038.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/gerovirulakulozosuw.pdfIn PDF document text
    • https://faceless.me/userfiles/files/61656207183.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/zilanizorabu.pdfIn PDF document text
    • http://cloverdiamond.com/file/likixibenuza.pdfIn PDF document text
    • http://vtaky.sk/media/file/70321713449.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/22e969ee1486d3c6f5ba20421182a047/97386304527.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9360d02bbe---rufamipasunimijakaduva.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923ed0a65e2---mejusadabudepovibita.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/20b3aba9b6062451fa62fcbfc9a3b0b7/91240106751.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d75ff465df3da673dceb5a1be6826270/diliw.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/zimosudavewu.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/96308067712.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/famadarobenelenoru.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zoxage.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nuacgrsqdgckhnvoff8lk3lts6/38128061156.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baff629b4e2---buxalojopekepuginudalofoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=day+in+the+life+of+a+microbiologistPDF 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_off00014073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001588a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588A 11036 bytes
SHA-256: 13b12b8ceedc5fc2653348f67d2d590af71bc5927ab663883169679ff7f15386