Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d49239c435451d…

MALICIOUS

PDF

94.1 KB Created: 2021-09-07 16:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50521542f4c4c37c2745112119fbbc5d SHA-1: b4c67972ae5fbc4ec8c1309a6eaea2a8c72eb2e4 SHA-256: d4d49239c435451de5746f2781dadd65d1f87a55acd995b9fc2144fcd13a51bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The PDF's structure suggests it acts as a link farm, likely to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://leosservices.com/userfiles/file/9069270293.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a6f901a3659dcfadcc50c4c177bf8d6d/73470507775.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/fikomifofogukasan.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/zadilatifibono.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210828044549.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/resujinujovujumuzezab.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d8a509360---83708387519.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/425450087.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/27461821970.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/42150598552.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/44428011653.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/66717242149.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33279779364.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f009ce40a0---makolimos.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f80c60cc4---75045303878.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/45235980504.pdfIn PDF document text
    • https://12shio1.com/contents//files/96125660563.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/xoroxelosoxebojedusa.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/75511461170.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea9dbdaba2---mirukare.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/62255617163.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b414f7e7055---vibixudavidatiwalukibuxo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493271a20b---92642233982.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/95753403688.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/fanudiluwerabigejifujo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b386bea1520---44669973066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manual+system+restore+win+7PDF link annotation
    • 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_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 20628 bytes
SHA-256: 98c0c412668f0a5c78b4a6c11f844a44f640e1f3a7fe73baaf9cedb3355a7f17
font_01_sfnt_off000139d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EF 10612 bytes
SHA-256: ef81cf0f4b506b563a63e9a4033e34f973aac8dc8644bdbb511c94713e38f0cc

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