Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb32cd3318ee9b6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 06:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e3cd7160f435b7c28484571348c151c SHA-1: 2fe3b9e905f27fa10d01c336cc44a9e5783c4c8d SHA-256: 7fb32cd3318ee9b6d206cd5d6e0807ca3cabb50ec43b86b2affe14ec17ce9a1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nsck-cykelmotion.dk/ckfinder/userfiles/files/regunibuwefuvikinofagetu.pdf In PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/59462020091.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/88117245622.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb9e0a4f94926b1b33146595ebddda4b/sumebapimobenozufalogon.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/pivenipinifef.pdfIn PDF document text
    • https://spyboarcams.com/files/vanixadugirekinuxarokix.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446d0f1872b---34273538817.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/365ijck9ht99rf1dm55fc51uik/42591259585.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/02b33a3231973c5a86a2a0e8f4d84f35/57472785028.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143975d1002f---xovumikoladetumali.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/55626380194.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/5671542133.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/18807603158.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tusefap.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/29485428834.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/2138979890.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/xezawozala.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/91296479275.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/mixasanitebofosojoxumo.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/10319492249.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dozogezome.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/31490629895.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/wugedol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gangstar+game+mod+apkPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/75274657263.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_off0000bdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 15696 bytes
SHA-256: dd8c28325a07b4ec12d6d75a4a4ab8b917c58790264593d122a518d2f1dc1702
font_02_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10728 bytes
SHA-256: 9dfd61ba1aeeb49e51c43d390458dc8fda643dbe136c1364d172a4e95198d0dc