Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea25d04680b4083…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ffe9efca886377a8378d7036f5a322f SHA-1: a2f1e83d10233c2c7038161d86a01e57517cef92 SHA-256: bea25d04680b40837869c3b0e41dc53eb8fb88e6009e72b9f0eb414986dd42e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to obscure malicious destinations, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates some links point to compromised WordPress sites. The document body is heavily obfuscated, but the presence of PDF-specific heuristics and numerous external URIs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=gta+3+android+cars+mod PDF link annotation
    • http://club-integra.ru/userfiles/file/812803167.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/tapubi.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/lanuwu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135aacdb973c---jeromedupokijewadefazinuw.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/todepazone.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/87835495876.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109120130236865.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/xamegowadolukamana.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/66659248398.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/95904441053.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/89664015266.pdfIn PDF document text
    • http://dobermanncz.eu/files/69467804417.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/butunigoroziluvu.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/59613030278.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/97168817863.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfaef875a9---roviru.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/zolepanewivedajifi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/fowakagob.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/67057972201.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/newexujivutasejozurabono.pdfIn PDF document text
    • http://centrons.com/uploaded/file/70421653261393d861afec.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/94549825310.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d609b49f4e---56996500011.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/rigawasikazuvudosebasama.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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 17608 bytes
SHA-256: a7b135cf0fcc31e3a00288da747a1ae87f124c20933f943b1d111044bf0e1fb0
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 10564 bytes
SHA-256: 46d8e353e15911aeabc817066646df179bf86346334332ad0fe54667e2d4f115
font_02_sfnt_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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