Malicious PDF — malware analysis report

Static analysis result for SHA-256 91efc0e0cee52dcb…

MALICIOUS

PDF

54.6 KB Created: 2021-09-29 02:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8dd454fa4c29e69cd5c0c36cda18be6e SHA-1: 7179e6479a9387c999fe11603b87ad7fbfd4dc05 SHA-256: 91efc0e0cee52dcbda58530a3952df687b8ef1c62a0e9f5fb0179c4592adc2be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Several heuristics indicate the PDF is a link farm, with some links pointing to compromised WordPress sites. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7526

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://chcial.ru/uplcv?utm_term=android+camera+app+like+iphone PDF link annotation
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/rozuxizarajogefitefafo.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/dofemokenosuzijeru.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/68594343630.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/nipofimipise.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/totenopad.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210924154428.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vureta.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/28545492774.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/44059798504.pdfIn PDF document text
    • http://speckrepej.com/upload/file/83176283109.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/laponosoxanakujitapim.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32b5bfaf8---47969148957.pdfIn PDF document text
    • http://aweibel.com/Photo/file/30648235038.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/80005501942.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/94561944203.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/69922136331.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vibatajotebizipireka.pdfIn PDF document text
    • http://fedime.org/imagenes/30937657971.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/fdb4fc316ef93027c92c7a4eb3504b68/28913146472.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17935997490.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/13477331085.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16141655436b6c---4972738207.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddef09d66d---divumodetixelaxudul.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 10588 bytes
SHA-256: 62a6084561a6366af3378d86932a2463308d6b2713f738510a8f439872f9ce64

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