Malicious PDF — malware analysis report

Static analysis result for SHA-256 921ba16d8c6b879f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 14:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b947173fd191c55775d60031668feac6 SHA-1: 31ba506259691d6a7b83c4ffc5bd204b3f923535 SHA-256: 921ba16d8c6b879f719218f5c00dd59d6d01428618e5be33bb18a49e13701985
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm indicates a clear intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/76692915357.pdf In PDF document text
    • http://sugarfree-gelato.com/upload/file/lobemovekolifefub.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/39526253000.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/qtphais2ko3f7gdrq8reug5aj3/7998335528.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/wuxabefemeroju.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/sejiwubuwopifa.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xibuvalabovuguxidik.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/lenugifuditakejovasifov.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3fea4508fedefcd94268ad1ca4d347e0/97954976968.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210824224157.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44db0214f---maxaxinuxugifakevunuxaze.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/bodaforafusojuw.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/maliruludasibote.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a05d86c4---88622773980.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d089daca---79692601238.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/bajiwunepo.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/wobower.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976a8dafcc5---93110864849.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160912ef7d7265---venakixogadavefajawomalu.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/82668524401.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/pafuganabumev.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/bodekikaxejoxewa.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/43683747985.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/92802260505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=describing+negative+enlargements+worksheetPDF 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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 11064 bytes
SHA-256: 1b9f253af4b8e9d4107ff8bc25624d2c1a72e918769168ed8e4a08514dcc320d
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 17436 bytes
SHA-256: b5510e7c5d25e64d9adfa0844af90aa590e816b3913ee3a92ee17c57d8b177f5
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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