Malicious PDF — malware analysis report

Static analysis result for SHA-256 3730d925242fe27c…

MALICIOUS

PDF

112.4 KB Created: 2021-06-25 12:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 07c2b6804d13801e0978b96cea0bdb9d SHA-1: afe5be451567ccf55e5f7fc5d67f8b69b6832a30 SHA-256: 3730d925242fe27c72d1b0ab6b3d3750796c081d6f8f8f39f194c26589804c47
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by an ML classifier as malicious. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The presence of a URL with a 'south african passport application form' UTM term indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://coretry.ru/uplcv?utm_term=south+african+passport+application+form PDF link annotation
    • http://samafb.org/uploadfilefiles/fasovosiguge.pdfIn PDF document text
    • http://scro.ru/pic/file/29966684530.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a54862v7etjm1lglg656brhe3/jubajeviwalaxo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/3918554246.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/bakuzuwekatawu.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/vezalugunogirunenel.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841758ed2d---50162093382.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/78779135655.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4372d10ad4---fivereve.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d3831fb19b5553298c5584f1df9e533b/72862812881.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/gajexovew.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/24636696699.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7735990c6---buguvirebubow.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3279a628d---bifowekuxuluzutogib.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b843a09be3c169ad56739003d47eca8e/9175765036.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ae04664db3ca185cfc7385385fbf7a5b/68044286773.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dd7ca66f---10786439614.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/lopizegugoxuxot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A8 10788 bytes
SHA-256: fd677070744aa01d0e4ed9fe4546c54d67c008680ebc0ddb8117fa199ffe0ab7
font_01_sfnt_off00016c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C47 18284 bytes
SHA-256: 25923a94c2beb65f616806a79fdb4800a521ff60e259ae1378b27ad2f93615f4
font_02_sfnt_off00019c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1