Malicious PDF — malware analysis report

Static analysis result for SHA-256 326da2852bcba0e3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 02:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 416e32e85d05abb673651b16ad9c730a SHA-1: d2d04da77d3ee319d9eb06c7f11a6d874213f5e5 SHA-256: 326da2852bcba0e3b8ef75611b7166c32888fe1904155dd39de4d07467005c7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely to redirect users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pixomot.ru/uplcv?utm_term=love+of+my+life+piano+pdf PDF link annotation
    • https://kildevangen.dk/files/dimisuxemevugowinadixib.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b566568b8e---xezufijejopizebuxavon.pdfIn PDF document text
    • http://ned.ru/uploads/files/pigikopuvos.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/taxefosep.pdfIn PDF document text
    • http://honghuibio.com/d/files/78020139885.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/vaxidizatajebe.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/nemotinemowaban.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/mikutubikekuvinowoderiz.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/87219551395.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/tunuperobejawedidonagud.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/79432875183.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/26741364563.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/jegun.pdfIn PDF document text
    • https://alpinashop.bg/files/bibeporerebidinivowuj.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/sivafom.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/38765351285.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/16801626925.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sewowareronemefalarelowit.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/bizobovozaximigogova.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/gotuvozebor.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c948de2e434bebff6159791d2d9b0641/wiwelolofarerotepasuvedon.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/derud.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360e6b4aba8---nalivarodawinenokepen.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/rinarufofofujatufurutu.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/malirarewovaketexavab.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460a52d3887---3829612842.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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 10428 bytes
SHA-256: 866514b4a50d1500dac76f5c6a67b6831cdf0054ccc2182b0c752c15c6aeb81c
font_01_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 15500 bytes
SHA-256: 9e03c28d2c60ea294ba7853b0b8c09e3ce53d8e0cdd404c786633cfedbdea06a
font_02_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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