Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30e1cd9b6a3b78f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 18:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 306bd75d9d7bd6f2c0f53fa094d162c7 SHA-1: 27355fb4997348ba152e8b1e915a22b091a3924c SHA-256: b30e1cd9b6a3b78f4c10c346b1d54a66671c409c795ac8d61e20e27b6a1221b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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=miui+12+redmi+7a+global PDF link annotation
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/banole.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/1893551558.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/49512726514.pdfIn PDF document text
    • http://jfe.hk/userfiles/2054023834.pdfIn PDF document text
    • http://allier-genealogie.org/File:/tonupiwaramubokum.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/40877701218.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/91163849689.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/zupiratomatalaluxujujipi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8c9059f0---32913887463.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141dff06223d---60451058702.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/palovi.pdfIn PDF document text
    • https://curvy.tw/upload/files/58287562389.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/nejesatudawu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/kukugupapit.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/71977466738.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69adac52a---girubigipijexenujuzukojut.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/10352633407.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/4190360566.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/47957658705.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138516106f80---xekileravokamefeme.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c8d2c44f---56253795817.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394b9cc9764---gaduzoven.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/69283616380.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/padutezaxezubub.pdfIn PDF document text
    • http://sooclose.eu/upload/File/muzadefevov.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 17484 bytes
SHA-256: 56c331c1d1a06349afd30033981df12ebe3bb49dc70bfb0b72c0b194ebb0a5d7
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10676 bytes
SHA-256: 1c3ff0162cec1376d7f0bedd8824339359a7c032f7a2467406837afd3e38496a
font_02_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1