Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c003888d789fea…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 06:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d0f29dd332a97f4ed433de6a505c646 SHA-1: 6d7491276aaf0df883a6125466a3deedc40b2d1a SHA-256: d5c003888d789fea08cead29ad230a3b3ee890a41f7f12ec426e70db3d7bad6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://pomelieagency.com/userfiles/files/96674024567.pdf In PDF document text
    • https://alpasol.e-giant.net/upload/files/75818018315.pdfIn PDF document text
    • https://parkettworld.com/upload/files/jafuw.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/326b00e759e5eb63104683ca40879960/63668971935.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/93834839401.pdfIn PDF document text
    • https://granitnet.hu/editor_up/37082132607.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/23457494290.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/99247433206.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/20622637488.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/11170267159.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/kejowesuvaw.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/2961558878.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/22655748958.pdfIn PDF document text
    • http://guowangcable.com/d/files/mexop.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xonovusezijujexefemedef.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a0342426bf67356f08be43d91804d8ff/lowovafebixesav.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/ritinusinubenuze.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6f49f71f---juroporesev.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/mimunanu.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/22070234169.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/30135474791.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd91be283---59508961712.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/43261999357.pdfIn PDF document text
    • http://didopack.com/files/nuzujo.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jiwuwewejevileminixobenu.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/25871266651.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/11076213015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+can+i+restore+deleted+files+on+my+phonePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/58164931186.pdfIn PDF document text
    • 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_off0000c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 17492 bytes
SHA-256: 270905d9dd5ded343fef1c353d4a53a5aeaaaeca7a9b9ca6198bea7a344968a8
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 11076 bytes
SHA-256: a6b1d344d18d699e05d9285a5358dae06e74830a1469cdb722ef7deb55909d86