Malicious PDF — malware analysis report

Static analysis result for SHA-256 f306c37576dec174…

MALICIOUS

PDF

58.6 KB Created: 2021-09-19 01:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed1e16a435b495b1ef7528b23e9591f2 SHA-1: 497c3f4d5a2dda440fed79e740315b5dd0ecdb06 SHA-256: f306c37576dec174333735be8769b134a106f5368475594ee47e05189f2f02c9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier also flagged the PDF as malicious. These findings suggest the document's primary purpose is to redirect users to potentially harmful external sites, likely as part of a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6927

Heuristics 4

  • 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=pokemon+let%27s+go+pikachu+cheats+switch PDF link annotation
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/bojolasonumopiwadebifu.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/56110820131.pdfIn PDF document text
    • http://ccadl.com/files/20210910234625.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/96644325784.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lobizapulapulazobo.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/32578039390.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/n8rpapkg463u19nl8chqpffgg6/vikawewire.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/16786628725.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372aa38c29a---30230251043.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/puzal.pdfIn PDF document text
    • http://gptools.net/userfiles/file/piluvelalusasikikaluz.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/81080324135.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/wexapidowimusixuloxovirux.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jcqpejgntt4t7iub2l0t83frt0/sunobezajokuferi.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/41415487931.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/xogesoneminevaraxamoviwiv.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134608255e33---54983076565.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/nifik.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/10981958766.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/10442406560.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/85640575574.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/9371137874.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/nuvevorexuwibuxisopezujo.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/10384538311.pdfIn PDF document text
    • http://video-cycling.de/files/file/80559796129.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_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 11036 bytes
SHA-256: 05a835ac1bd2bf53d018112a729ae9a53571fad2ad3be68d62aec50c6428952a

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