Malicious PDF — malware analysis report

Static analysis result for SHA-256 764661bc6a5c8a63…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 10:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7f45550061d4dac173b03db7f5c060c6 SHA-1: f1f9572796b837eeded2b7556fd4469fe9b1372e SHA-256: 764661bc6a5c8a63315aad1f80f3bd52980c287abfd1d8164b394907a8e8e16e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6354

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 http://vo23.ru/upload/file/gizafutabukeralinowizaju.pdf In PDF document text
    • http://technology-mp.it/userfiles/files/40599795291.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/43560004011.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vivobomorebavo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/sadikuvidorirefigog.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gqb03332b3421eup3ldr8rop72/dojofoxadi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8f5352a6a27994bf5492b06f8144a6c4/nididex.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611a16fdbb006---68036645619.pdfIn PDF document text
    • http://gibisch.info/files/files/ninor.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ae0ebd6a3e6b32dec324c796a24168ae/74099737056.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f60a8458---kawisunalozetuzobozorunan.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/77842478265.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tisaburedugiwef.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/40975104370.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/xadugukisilugene.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738b4dc4cbd---kepatuxo.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65ba0f7cc---kizekefep.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zobofapivivolimizijop.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/33587820742.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/58479882930.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/837b79b4affba33c33a5261aa8e89d95/ditil.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qgqrv2h8g3iemai94fri0839i/fibimerutobamijevux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=different+types+of+corydorasPDF link annotation
    • 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 16640 bytes
SHA-256: c93f61a847d7f8c5dfd5558fc050ee4e1a2a6fc488ff67a47ae98f4444101736
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 19612 bytes
SHA-256: 8529548adbf071982ce37d320e128eefc7114493a489639c7338a6b2a5ca999b

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