Malicious PDF — malware analysis report

Static analysis result for SHA-256 078007f9fa96a021…

MALICIOUS

PDF

83.2 KB Created: 2021-08-03 22:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75f3da0fb9b509192b9ab547e7bde66d SHA-1: 4745a5e73219270685f4628cfad05b30c875080a SHA-256: 078007f9fa96a0215ee4550ba0a4c6437941bd8322f893b7b82b23f91d22aa88
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9354

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/67f7e7f5d1260e6f7bddaa0eab5ada65/widafarevaki.pdf In PDF document text
    • http://digifast.cz/userfiles/xasexeludoxufapakir.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/77dib9fiqhd3u2ncl5g2fnnuep/23384020194.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/warojiwoge.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/674s490l3orlkklmaf0c8hske8/88662203227.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wogaxetarugewoz.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/nofinojenedawij.pdfIn PDF document text
    • http://kco.su/userfiles/file/70846598723.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4068e4d5fc2650646ccf7e419154bf83/19610397260.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1cc89994a---lamasikuwupuwidix.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/43547493287.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/02a8ec9d40773104c60a191f212a0073/18450616046.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dagadikadeda.pdfIn PDF document text
    • http://contactconfiance.com/files/files/57692581709.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zelidinerexena.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc14e56c90---pitifizimopapuvekebizusan.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/37245766566.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/19081890878.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/99036281602.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/31obsh02srv2lnff8hgqvb40f0/59442064344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+an+interview+essay+conclusionPDF link annotation
    • 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_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 17108 bytes
SHA-256: bfb06fd2bf484bfbd859bf382349e21dabac0367b20be93931016eef769b124c

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