Malicious PDF — malware analysis report

Static analysis result for SHA-256 521cdcf5e4bc6a8d…

MALICIOUS

PDF

63.4 KB Created: 2021-09-01 23:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 600f28c7a77221ab90d79fc5fcb0ae36 SHA-1: a32787d79d1bd9e136577f16c433d40593d3def0 SHA-256: 521cdcf5e4bc6a8dfde7933cb9384e84e9a47d5e61a3593316f29d0f1ea6d6c8
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to exploit users via phishing or by directing them to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7970

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe3b091e2---lovesubidimu.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1997d2ad4---supebawovamik.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/6566fd7b1e91a5c754fb319f37c453e3/86223342986.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210821_677E131A301DCD7E.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/46dbc06554d6b011679aa8ee3c25dfd0/89159166749.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/mivaxiz.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160919ad825444---48352471074.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/48798460878.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0028d48e94---85157233545.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b108f959bbf---satewabuzudipedobuza.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/pidifalexawoj.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xemusaxemuxosoxumasanelus.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/22860807468.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609156ea9f026---99086011088.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/bitapigilodi.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/zuluwemosozifajo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/05gu4vr7fd2lan80ghdigvi4ab/50747769203.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/insu0u4nnv3ojspu0uf600n4m1/maxawogurakitejanof.pdfIn PDF document text
    • http://apex-architect.ru/images/file/42458369780.pdfIn PDF document text
    • http://didula.com/img/file/93311392250.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdfIn PDF document text
    • http://ahchala.com/img/file/sapefedika.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc44134585---wepozopalefetuvobusi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/73f442e0a1cd3ed130b5a619e4ad14b9/22809133776.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/dujexuvizilemefiwosevoba.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/eff34cf977497718065277ae6b055ebb/dikubo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/dubopiparaxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=photosynthesis+lab+bench+virtual+lab+answersPDF link annotation
    • 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 10832 bytes
SHA-256: 38cabbdcd991315cfede303eb719d42c35bafd11246c38930b75e1fd389d80f2

Open this report in the interactive analyzer, or submit your own file for analysis.