Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91991cd17383cec…

MALICIOUS

PDF

90.2 KB Created: 2021-08-21 07:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c9c2e4133c8db9e8b2f1c00f3d64c281 SHA-1: 7874e2de78de7b88e57bf49aeee12ba01492ce4a SHA-256: d91991cd17383cecf956a9ca0332f0974aff3c04917df45ac3c0d10c275b40f2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3113

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://geopraxis.it/userfiles/files/35921287959.pdf In PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jobaluzufujozojarimomidev.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/roxinewovovu.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/9eflo3i1kfhrpeec9ku9j9tnjd/31853777975.pdfIn PDF document text
    • http://ledins.lv/cms/file/bebudeludikukalevigovav.pdfIn PDF document text
    • http://ccsl.asia/files/12285552888.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/58184750721.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ad7384d8---bamokafipi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32ddcaa687---jofigigojevaluvofo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57f24646e---fanasok.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072401ac71fa---76571600572.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/582b60369cfcbf064ea5beddf3e448d6/16510705846.pdfIn PDF document text
    • http://bakoca.hu/files/file/bitusiwawesasaw.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/816b434e81a0459ecea9730b85a79e71/dukabiguvajovomufiwazavo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835a20662d1---vabidanisikojuf.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc3df5d70b---pisoranofuruvexisoni.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d660b811---95351277626.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9b0c43e1---rerawejojovateb.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/91731980455.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/zujuwe.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608646da8a2ae---funexave.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc4fcf1cf---bukulup.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8bb087b04---63727623277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+to+z+mp3+song+hindi+music+mobiPDF link annotation
    • 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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 10976 bytes
SHA-256: da590e31b483803e9a30bc2511523bd5158361ffe560f69009444a82907153f2
font_01_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E17 17568 bytes
SHA-256: a361d6485e01f437552bce29a7433152be0145caf6b9329a4a75452fabb94d70