Malicious PDF — malware analysis report

Static analysis result for SHA-256 c769368cbeda5a9b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 06:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 54c8a25e2a723c4783dc4705271a67a2 SHA-1: f0877ff9c9d92c20cb498b6ab844cf9ca5424ccb SHA-256: c769368cbeda5a9b014f0a8448d95444d1766eb8c62efcddd19f7fbe06da58b3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coretry.ru/uplcv?utm_term=boruto+chapter+59 PDF link annotation
    • https://aarhuskortet.dk/images/file/71997652489.pdfIn PDF document text
    • https://rcot.org/userfiles/file/47582293545.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/gifisomelafanorenubuvuf.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/77807400148.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c4ec4b9030b3d92dd91e3682f656f439/woxumakedudejive.pdfIn PDF document text
    • http://licausi.it/userfiles/files/zikiriwejarosuz.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/27299853457.pdfIn PDF document text
    • http://safarang.com/basefile/files/xibanis.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/92712228161.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/61527438990.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/josisigonopevomewik.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/121745133.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/maxodoripiwovukirimuf.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/83830994777.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vizujikidotikegamenudugi.pdfIn PDF document text
    • https://frisch.ro/files/file/maratalosoduwago.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/ledamuwapuku.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/66133083087.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d34db902---darizitetimunezava.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/22902129624.pdfIn PDF document text
    • http://ipllaser.in/uploads/96153452209.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/togikamuzelak.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/77698945482.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/vusore.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e57d1ceddf86c5580eaca50c3baa9d81/vibekuvuwi.pdfIn PDF document text
    • 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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 17524 bytes
SHA-256: 4ee8903df647d16ed3f13fc03638c6de84b1fc8a5916e7907cceeb6dc49bd0f3
font_02_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 10516 bytes
SHA-256: 82825172dd257a844cf1e59e26065c4a1f9654bf7c0a0b300eb3f5a29a7c1a6b