Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a7d333a2dece19…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 14:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42d7a721301680247d4a7c78eaaa26c1 SHA-1: d3522a43e6eee255b33f5ba8c9ee8152675c2b63 SHA-256: b6a7d333a2dece1928cfdc8662a5267206e97826a4063af706838c1054a57f26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=univadis+msd+manual PDF link annotation
    • http://studiotecnicomaglio.it/userfiles/files/dovitobizudevomu.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/dojojasofolufovigonabove.pdfIn PDF document text
    • https://bnovum.hu/downloads/lurifufasazigosolit.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/33701678187.pdfIn PDF document text
    • http://ha-sine.com/d/files/bitofebusewodakasifo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16102a8d7c4c67---78557154920.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///66071770540.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d5780db1bbf27e04c6a92748aedd0e19/wevelofananaxota.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/64767013214.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qtbmei032a1r32j10o6s7jvdj0/wemeniveseke.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2baa0d37970bf6b82daffefa4e87c2da/38063085156.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a522838702c8a90b53ebc3400e7b435/xifemifopukobelawefutodo.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/83905603182.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///tutegilobanevinejitipate.pdfIn PDF document text
    • http://synphabase.ch/upload/file/35821546572.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/23647286574.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075003097574---zobusijoruwiv.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210621214329_wa8my7.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210722053133.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-31/20210531043354649653.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/giziviba.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-15/20210515103632185707.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/sidajonedezogedo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607169e53d902---wupidewufop.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_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 19424 bytes
SHA-256: 7b86fae21585d5f227b3ce07487d6b8e4959de2506e58a538022d835f0f75d4e
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10132 bytes
SHA-256: ae764e4d7350a08c0f0f52d5b897474ee8f9451596c6b89fbe29ba38254075e7
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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