Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cdad7959257c17…

MALICIOUS

PDF

83.2 KB Created: 2021-07-31 03:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86a097d3f6160ac07a2db209336a7339 SHA-1: 70ae761923307f14a8e6ac79cbbca0a28f9a3779 SHA-256: c3cdad7959257c1790b7f7e34b2e6a6c5bfa007291f27a1e669e7cd5ba5d8103
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5610

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://mclarenquartz.in/ci/userfiles/files/kobumugenefalola.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790b9122ec8---75326296966.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/xamijabaro.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/moxos.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/70535522737.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/93472438778.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/bvievfose2dmfb2flhivqsmoaj/bemugexawufapanamerija.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3522264366b6bf03fcb1bcf56acf8275/fotajoromi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/60997358975.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/72455663596.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f84af2a33---480452907.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/i1rec38qsag1smkjogbv62ivat/12673705999.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/33956735838.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4i2ubuh06hd551a6js16lb9anq/50406285845.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/mikoxaxu.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/lakuxineremizabafemavig.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/vidinuvogarusoxavijemu.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/gubok.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/36385417a5de2e7798174ac523b8b906/49349738692.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/47476384344.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/2243829360.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47e49bd37---18923288635.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d14ae22beef236fc7dd1d591cb974e50/vinuwaragob.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/14aac3527274269a33b729c20461ad37/29282850916.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/goxobonetulule.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kukiveni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manual+de+t%C3%A9cnicas+de+terapia+e+modifica%C3%A7%C3%A3o+do+comportamento+pdfPDF 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_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 17672 bytes
SHA-256: 5b751b6a41234cc28be1d16643a049036df2fb9931240629adb694cc8655a520
font_01_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 11492 bytes
SHA-256: 2570a8c95031f7b58128f655655ce115fa0b62c5e90a027eace0586aed6ad935