Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd577c5f81cc3c52…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 23:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6757aa8616652e2569587139d004b00f SHA-1: 4f85b607d0fd77ca68517bf79628f80928c3c2a3 SHA-256: dd577c5f81cc3c5279467956d94e3b36998a10ad33714799959baad772937b7d
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. This suggests the file is designed to redirect users to malicious sites, potentially for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5698

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://ostrichtours.com/ckfinder/userfiles/files/gimuxijefagasorisor.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c4c6f2676---70374590390.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/25903165164.pdfIn PDF document text
    • https://angkagenap.com/contents/files/25375101170.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/99848361151.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wumuxekevutinipigajigogo.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/71980825543.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/21186904080.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/muzowupabozitipuwi.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/pinopinisonavizel.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/33984012544.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/35762136484.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d5f48813---jitatubumexu.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/pezuwa.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/luvimubinemixo.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/36247519299.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/40869725772.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/29866dbec3870273fec1144f9c73f4ce/50711260998.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/xufeki.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bce922a31---bojepuwevijarunaruji.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8611baec5322ee2c302f5de6c614377/pedijuwevejimuxuxuxejili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=yogi+tamil+new+movies+2021PDF 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_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 17872 bytes
SHA-256: 29e086149315f1e80a693b5d1678dee5057f274a63cba08584339bf0bba4780e
font_01_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 10780 bytes
SHA-256: e2048f1f0a8b306eb05c5edc1de30580d7add442f708daaba983c9d4f4b6d80b

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