Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb5d74b2cf04da2…

MALICIOUS

PDF

62.3 KB Created: 2021-09-17 10:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dcd8b56221bdbff765302d15f0c0351 SHA-1: d2abc4e79cbaf2090f4542494837ddeaeb07f4ca SHA-256: dfb5d74b2cf04da219ef7e77b1e5ab228a357d7a0382caa9a18d1af888cd71d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://inwebjor.ru/uplcv?utm_term=my+chrome+is+not+updating+in+play+store PDF link annotation
    • https://cpsguffanti.it/uploads/file/raxidekamonapiwogulemu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/84467695940.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/96086211416.pdfIn PDF document text
    • http://terminsk.by/pics/files/dekutetilofatezubilagunu.pdfIn PDF document text
    • https://dcimx.com/files/46624444214.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ec3b64b66556be41818a8646ed1a1c4c/20567655357.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/nodutasisuxavato.pdfIn PDF document text
    • https://jagominum.com/contents/files/zutumugedivasabep.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/vetezeba.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/47764807768.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/bijozidumujosar.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/33069277422.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402e685fabb---29458657018.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1aa9e791---86756741050.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/56685255946.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/begenodi.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f640de23---nonururevara.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/6186548278.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/31321147014.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/efce06aabc027908ff03ead1df914d30/89536842050.pdfIn PDF document text
    • https://aildf.in/userfiles/file/wolifedebisisokidi.pdfIn PDF document text
    • http://rayer.cn/d/files/podawunowi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021e6de147---kijelusakusiwi.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090508444855.pdfIn PDF document text
    • https://mbbs.hr/files/ganowos.pdfIn PDF document text
    • 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_off0000cabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABD 17516 bytes
SHA-256: ea2fbcbeb9de3e84469d51166657e80ee7db97003ae1d6d59afc4733d6c722e6

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