Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a500e59286b890…

MALICIOUS

PDF

67.9 KB Created: 2021-06-14 03:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a2ad6dbfcd2a1c926f0884f5810e6738 SHA-1: 4712b75c24630effc920e027a363cb7757115f6b SHA-256: b7a500e59286b890f0e015d8e8db8a5a00a03b36b98ecfba4d526213473f46a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7772

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://coretry.ru/uplcv?utm_term=download+apk+followers+analyzer PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075030c467cb---62590746205.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e22fb6a84---nipavufero.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a19ebb7ca0---68931399873.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/wumibuwoserad.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/46856896396.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/tupitaxumawurogu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/jomadenubonitoxarifovinuz.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6c37fd687fcefbfef7576d25f423730e/rogubusopoledi.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/megovujuf.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/72938928881.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816a4967834---vanopotexobebe.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5b1dd21956a882d4aebaac8603c01a68/81599644318.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/divosowavimaba.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/68408748196.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/tufokulowupazeduw.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc94249632---72802539204.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/wubefimotiworizunure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5340 bytes
SHA-256: ec87fcc07c4f79b565249e187cba1475d3f36460865117e3f14894a6584054ca
font_01_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 2212 bytes
SHA-256: 0b23cd77a9bd50abd9090c4941d485c25ee4229fa4b6297beb91a99c5f343ec3

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