Malicious PDF — malware analysis report

Static analysis result for SHA-256 6263b25f434d4bfd…

MALICIOUS

PDF

83.4 KB Created: 2021-08-17 12:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e8cb9c654973c27b4e71a5b18059142 SHA-1: db4009d176b1c68c66356233c7a2d04283c9ea7d SHA-256: 6263b25f434d4bfdd7a340bd14327e402a4212e107149b79bdb95b0ad04b15b3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are either compromised CMS uploads or hosted on disposable domains, indicating a likely attempt at SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://cafesezony.ru/fck_editor_files/files/94260936237.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d1b0a0f9a---dajebazilonog.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/80904759577.pdfIn PDF document text
    • http://rc-modeller.se/images/file///43210709370.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/tirakawexekiji.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/f2ce5vb54238063r5mr4b818c2/buluwutopufi.pdfIn PDF document text
    • http://juha.be/_files/file/jelubukokoranepenube.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/05e8eebbd5a9a05bec1c053f17c78472/famowebodunageweze.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/63176763103.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/diveruguvisovuvogupag.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/famojitavimenezifepipokas.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/m9s9i5fudouo7eld23k0l327oh/nijalozakopitabixobo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/895825aeeba312cd53868397037895e7/vamuru.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/41397648458.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/88095495489.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/muderiwexivan.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/vovuvakakulu.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/xodasejedo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/044d3f7aa707df61980d4ac6729675a1/3076142336.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/jodazakewijuvome.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/bagewodugelejap.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/19699392942.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/bc34ecd0e6edbd57426ff5c3c692da01/17469441178.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/9993741363.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3481c8b1b---zurunasirapovet.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5s6rn73vdtel7usfmh1i910jo/vanevan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=alphabet+coloring+pages+for+preschoolers+pdfPDF 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_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 16796 bytes
SHA-256: ec0cc0ef2c1284f75f92819878ee33e5f4b022ab931f171ab30895dc2ff809b5
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 11020 bytes
SHA-256: 2f52a9516cf34f6453daa59d6cc7b8edb830e68f9df91a7030ac18d41702ba05
font_02_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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