Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9219cf7bc6a8a1…

MALICIOUS

PDF

119.4 KB Created: 2021-08-20 22:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8dd0ff6b2db8d3694646b7fb3bb787c6 SHA-1: 1a81ed2d15836a83d0a88a5fb5675362fc8dbf25 SHA-256: 8d9219cf7bc6a8a16da8f2a601e0c52c6b1973aba3c7308b0965f773c99d2ac9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests it may be used to download and execute further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=simple+way+to+draw+a+rifle PDF link annotation
    • http://tochuchoinghi.org/files/lulotovuranigakiga.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/81633648636.pdfIn PDF document text
    • http://potya.com/bitaru.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/vaxipojezedokenol.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8e474c0f---29748761907.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608409a203d7d---riropufodamezirajadifo.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/33073534793.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5827934da5---wawesojuxalegobig.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/82860554610.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608586df422e0---4601961079.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t47s6onrt479oaurjbek918r2g/jasejiperoleromar.pdfIn PDF document text
    • http://myphamasia.net/upload/files/7764981721.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/25015738518.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/87308131696.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/587c07b713312985a961d5dde2fb4f55/46732158107.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/nizekorif.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/tavasemedanekaruzi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/rowogemedu.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/85242839926.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/66350321259.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa05bad6a---nesipojagumolujuwuromofa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608774654ac65---kadumoxefagiximime.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/xorotipetufipikizib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 10664 bytes
SHA-256: 5f0a115c5f23a0a5124298f298d922bfc7d94fdf4924fee0be182788b3301f6c
font_01_sfnt_off00014949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 20328 bytes
SHA-256: 73c43ce017452486b7d18d91fe4d8e11ecfac3dcc4aa5823e9a68d7a34bb3c74
font_02_sfnt_off00017d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19525 19076 bytes
SHA-256: 6dc6edfc4c42912892882f3f790540dd250d862068e30487ede4b5479849166a

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