Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c890bd3c05566c…

MALICIOUS

PDF

101.8 KB Created: 2021-09-05 03:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0057cdb4f9442f649cdf408d3a1d2bcf SHA-1: 1e4a811250c4461e3ba1b68c1097b28f9aeed542 SHA-256: b0c890bd3c05566cd6e58915effe28adc2d4c0bf719666bf459f7609e703cebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various websites, including those hosted on compromised WordPress installations. The structure suggests a link farm designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=magyarorsz%C3%A1g+alapt%C3%B6rv%C3%A9nye+k%C3%B6nyv+pdf PDF link annotation
    • http://m-s-g.ru/userfiles/files/5348672043.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c5934fa3fec0f24ea0bdf322ee1b265/48368006019.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/tevowunalapaxomugasiva.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b6bf8bec171c983c85f10e590ca56ac0/87398066383.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/56733817280.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/13917407866.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078072593531---lasufonalizuwaw.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/84014528903.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021070714452273499.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/97m1voevja30tvhukisq3b5hvc/lurufisemokidezowarazot.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1599422a0---8656495223.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/880b7f3753b7b2a1d71b5bbf4ab7744e/kirake.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/27178920300.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7b09312073829e8598b16149ff143f9b/2844738973.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080666f87b2b---88859476762.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/sunexe.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7pd3ko0qa0k367ru44nao690vi/vugedigevusixipasotodika.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pijisomewatetife.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fevipafugenawefew.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/67239550060.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160874bb894ccc---33231134180.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/24491389203.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_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 20056 bytes
SHA-256: 1b83f7a17623ef49b5f86acf25ae23b7e3153554370799b08d407a6d0fdabc86
font_01_sfnt_off00015519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15519 11456 bytes
SHA-256: ff3923a3a4ad39a21b8a67e15d042b980b04f8abde990e2724d3f2325507c530
font_02_sfnt_off00016f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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