Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f21e9359666030…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 14:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57398581c34f93a0f406e57ebbc8d2bc SHA-1: 2563ce9a01083583d3c5000a86a885b947a54080 SHA-256: 60f21e9359666030de604f27292a44417bd546acb448ba61378f91f92bfb4650
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ue0ttdki8bg1l9k0j8pqpg0mug/dejirupunefexirakapebako.pdf In PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/fegurufivozuwotaku.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/robubetegojazubapeludax.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/zusapuzuveja.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/nimudipilurezonepowe.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/44870416366.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/98154474947.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/lobijatelivifevurukokisup.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zuwapetitudapa.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/nulabujemejuvubawivafi.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/42702978191.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d67de135---51403333339.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gaxusunadafegik.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/2898716873.pdfIn PDF document text
    • http://quranday.org/userfiles/file/28127773499.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/28761122565.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/lapajonirogidoke.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402117c764f---jarereje.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/99598493505.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/goredepamaduvixadokib.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hui3o1dri279hd44v8os2nv3ph/zusoxatepuribavekugudex.pdfIn PDF document text
    • http://www.bash.cl/media/file/65968844741.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/50699907252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=app+para+descargar+video+en+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 16916 bytes
SHA-256: 9bcd24be8d5cd0d5ea7252d94818875a44d136b7f37747d91dbbb97652454161
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10592 bytes
SHA-256: b9e35002bb3b1ad9e9bf3bdbeb01c56bc2fb4f695a78dcb14efe6fe2a829eb15