Malicious PDF — malware analysis report

Static analysis result for SHA-256 821ff6a63b26e01e…

MALICIOUS

PDF

81.7 KB Created: 2021-06-28 03:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 912aafea0a24665da5a51c4e5ea5ca99 SHA-1: e0512180064e753060641bd15936a62eaae7927f SHA-256: 821ff6a63b26e01e11e158e4d4efa12e4ea00f31c01e92a48c91ae8d03352257
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a link farm strategy on potentially untrustworthy hosting. No scripts were extracted, but the overall structure points to a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5544

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=what+is+worship+biblical+meaning PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4912504b---zarexawidije.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/61973125896.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160813787de680---sotunoxamebeji.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c56cc8982---dipikev.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d340aeeb7b---wunidufinap.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/i4k1upvpsmiba46h8gkvacgsmi/87639605882.pdfIn PDF document text
    • http://splogservice.ru/content/file/1003991740.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2650a8dce---daxusewug.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16247756241465240240.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rakijapeniba.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/kesekekowor.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160991c4d698ec---77263927759.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vifupeveto.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/674470148.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ci6c3k6t7p1e8v3r4qivh2vmdl/nipezukusuxosubifepopos.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/56a009a29ac564e80d884737baac3f85/rasabekunapevatixif.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/se7ha2su3fvkapf067vplri9j0/1696989094.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2a78cd073f6fb94cd7c57f5f5ddfc7a0/kejifuvawajuk.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bg7qsfn45fs4tk924tgm3lkmn1/fowiduziwuxepuba.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/lerilewu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/68086423247.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 16612 bytes
SHA-256: 8c71a7e0af608b49b78e56cb5615c6e63680a3043f1f69817880d5f91e148aac

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