Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3495e53ffdf5e4…

MALICIOUS

PDF

87.7 KB Created: 2021-07-21 20:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6e94771aff1096f1391c2e8dece8259 SHA-1: 431bc7011c126a7604fa33d1a91c6616f88258ca SHA-256: ec3495e53ffdf5e4239a87d6dc5a2ea9062bfd5743e8883d80423247e8b71676
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these link farms. The document body is unreadable, but the heuristics and URLs suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6136072b---gesatigefukiremi.pdf In PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/zisibalobonofagesuwigesu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075921798624---vonimezifiba.pdfIn PDF document text
    • http://martonelektro.hu/files/file/limezurufegiz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d433c47f389---furunerelanu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a9cfebad5---kirunisujowux.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/s0ot7gao2ki6s5jsfb1uh193c6/41197095406.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/noxobufelagutunivixu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c987a685bcb---90330204464.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/kevirasomapifubewewiwinav.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0a9cced7---41084094224.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/74890841824.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kixazenegivo.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/82189992327.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/21197337252.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/61039231264.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba664dfd5---13029644326.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/faxidigogajogafa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6jck2opoq4fb1ahb1233vks3hi/33196853472.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/84860549547.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b61961e3d46---17937161856.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210630150324301490.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/12517196861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+clean+nose+ring+holePDF 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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16960 bytes
SHA-256: 38ad079ce140f4c93010f8fbd6e9af03b9fe4c6d371f06be1f91ff411835167a
font_01_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 10588 bytes
SHA-256: 8d6e5336510331ccf0f4134a816e3392ca982e65dcb40a84b877f22ef872154f
font_02_sfnt_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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