Malicious PDF — malware analysis report

Static analysis result for SHA-256 65051f80c440bbd9…

MALICIOUS

PDF

81.6 KB Created: 2021-07-25 06:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: faee48ace87e70283d1d5113babedfe5 SHA-1: c3c0f8295b00f7010cdbd300c4b01cda6f73192d SHA-256: 65051f80c440bbd994d64ecafb1e92405cfea6976420a568f048a4e1b7bf3084
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 http://wittlich-luexem.de/userfiles/file/tegizosipub.pdf In PDF document text
    • http://wych123.com/upload/files/rididibidirobolesedu.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/vigirirolepivavaponaz.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fktdf17pmlb4vl3jbpv4htdqjj/4283732260.pdfIn PDF document text
    • https://businesslife.com/content/file/86149436626.pdfIn PDF document text
    • https://schmitz.cz/res/file/16020514096.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079e520b0c21---piwegabagorede.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210619262_636508768.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/waxugalamopidiwotorirexeg.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef10be308---93123442923.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/439a140134e7677d863bbc2329d82686/doganelivowibenegexaf.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/sovumozosekopomew.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/16343349624.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdeb6521f0---jifeposa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/29981553101.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84903664608.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a72e39a97072fc123ce3ab6a2e2f57a/61557828956.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee311f55a---54620638786.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/parezekobepotoweluv.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bdea27e215a1e6ce7ce82f607b85beb8/gijepunubidaponatutif.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7lm9qnl9f9ahupj6qdnarfq17c/pulatuvazeropalude.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/reditilosazurodufaziwamel.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3576e388f9---mukerokabekit.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/39309468101.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/bonolunagowoxukevuze.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gutirasum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=california+physical+science+textbookPDF 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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 11056 bytes
SHA-256: fdc32c1ec7d8dda82b0a2d66b4fa51e9132790ffe39d8d31b47433fec6b71cb8
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 17440 bytes
SHA-256: 8c7631f271b97025f270ca9af81f69eda9dfb9f25ebd09ba067462c3a7662378
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1