Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab669cf71ed0ab4…

MALICIOUS

PDF

94.4 KB Created: 2021-08-14 21:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f72c83ae43b782f3a76cd9a801b392a SHA-1: 24646d32aaa339957a76d5daff649c6cdb629bc4 SHA-256: 3ab669cf71ed0ab406a0c90879b83a3ccd107428d98a016fd92e7bc8f5955d39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or host phishing content. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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
  • 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://synerhu.ru/uplcv?utm_term=arctic+wind+portable+air+conditioner+10000+btu PDF link annotation
    • https://clifestyle.net/uploades/userfiles/file/65399522864.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/8260125090.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba56e6e4158---13009764414.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/34732129794.pdfIn PDF document text
    • http://maulich.vn/attachment/files/kuwekizusozifexofaxiv.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/5631434892.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fenariwilobelirogura.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/53054587015.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/sosonotegirukajinizex.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/perutexaborupijugo.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/36929801417.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/98621155433.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06083b30d8---zafefejejomujigibefawi.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lozitavoxaje.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8qmnassm1pumtv48v6jveh8266/16470404421.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/zesokibilukutumigatawaj.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/31012093809.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/01ihq6jghp4n8p300ifmamin72/xerodude.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/227e78f2eaa610b2c6c811df9f012362/xonerup.pdfIn PDF document text
    • https://goldenapp.net/file/tenimotavaparulimoxami.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a774600fac8---vomanazuzavorami.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210713192608.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/31854064569.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_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 17004 bytes
SHA-256: 1bcbf1b094926fd6fbf02beb4c1afffbe4c8ee73611988a8153e445d15b3eda1
font_01_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001508b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508B 10820 bytes
SHA-256: f513ae156dda9c20da4cf1257720ead726fbd231a11b962fc829fcab7317fb2d

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