Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c0a1fef1f27cae…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 17:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e9305422db2196f63c26134952cacee SHA-1: 4aa1e2af31a74354bcf8c09621817b8a23e60e96 SHA-256: b2c0a1fef1f27cae51fcb225cbdeee5db20fb286aa7bb0fddf3b1dcb45341a6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=gta+2+mobile+apk PDF link annotation
    • http://lifecare4all.com/upload/files/24526167766.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1402b0d57---zewodusux.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/xugenelikiluxipavo.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/jegalovaxob.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161468fee4cc70---93084172229.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/kugilagemigojazeto.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xudadapexosupovav.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///penuluturulimozomu.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/96314715538.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fodetepuromuwavedife.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/fec751ff2c93f08c3d8d684706e3cf24/pagesudanarozaguwu.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/kizidejulaxudoneb.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902154233189007.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/17209197851.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/dajukagukepifodux.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/69488396314.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/50561117723.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/78575468807.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/nofuwanevokawutexedet.pdfIn PDF document text
    • http://state-lithium.com/upload/files/bobiwu.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/tenugizukaginadobisinidi.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/53369121909.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/73778993876.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/keludobe.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_off0000b685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB685 15604 bytes
SHA-256: 1fbef4590f2993735dd2fe816a8a3eef1e3e608389563443888feeff1c6526e2
font_01_sfnt_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 10432 bytes
SHA-256: 8cba59cedea1ab076a64033103be72416417104bce534116994317056ba96eb9

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