Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6cf7adcbe15d9d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 09:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7469efa61ec254ccbc377c29529292be SHA-1: 02f09aee35633c2db720bce74098fbfa33ecf0d9 SHA-256: 7f6cf7adcbe15d9d815b0f9dfe54b5c354f3c06708b1cb28b57e77dcc9c9fb87
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=pokemon+crystal+1.1 PDF link annotation
    • https://hurghadalife.net/userfiles/files/jamazasad.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131a47e6ab9f---rukigabunikusazol.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/79403820095.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/50644869183.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/89687174836.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799a173c63---1518331426.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/tipifirowa.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e6125fea5---97236761238.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/32424377813.pdfIn PDF document text
    • http://scsytech.com/upload/files/novejuliloguw.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dapedibunikodajumili.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/dowixifiz.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/mupekebolibus.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/detor.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/wudore.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/27354056625.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/nosufug.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/viporuwovuwem.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614838a17a025---29536127284.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/8916242257.pdfIn PDF document text
    • https://advik.net/userfiles/file/6658205232.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/72604449959.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/46676612181.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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10624 bytes
SHA-256: 6101d28f8ad1851acadb45845d1c18bfa5fa9f4cd996f993708365ae08dad2b0
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 19728 bytes
SHA-256: 00b4feb82548953de69588f4a8d70b29ffd81046913c20389ec6ed8fdf6dc337