Malicious PDF — malware analysis report

Static analysis result for SHA-256 dece63a56cc38146…

MALICIOUS

PDF

68.1 KB Created: 2021-09-17 19:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48d439c5ee9df7b06517fbeaa421f278 SHA-1: cd9e2a42b26671d3f1df89b704919d45f5f23f30 SHA-256: dece63a56cc38146e86c1a267e38fbcd9f0593fb3e4211d13ca81ee3b5a6a313
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several URLs hosted on compromised WordPress upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5291

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138199c60ed5---popilepe.pdf In PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/38575278352.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/sikubogeteveximumeji.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/zoxinepulazujovumi.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/90072279405.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/84591379756.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/34094882607.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/wojimatawozodowiviw.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/bifinolojuguvokibawizipan.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/49071753508.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613264fb71247---42279604679.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/saroxofinogelafekir.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/10162651061.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/pinagun.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/50009741012.pdfIn PDF document text
    • http://kunbot.com/upload/files/75856153804.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/94624278970.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/72443145226.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/33317553199.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/puliwobevudurisivaxa.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/duzorone.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/42526373970.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372a0e87184---8842271996.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/zogipal.pdfIn PDF document text
    • https://blugarden.eu/file/43317688629.pdfIn PDF document text
    • https://123natura.com/stockages/files/duzaxavewitijabuxedi.pdfIn PDF document text
    • http://boxethai38.com/upload/file/53485497903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=deleting+read+only+contacts+androidPDF 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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 10660 bytes
SHA-256: bc9fdce42d58acea23f24ed4c129ff0ad8237bb6ddda9890aa8df775c6618823

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