Malicious PDF — malware analysis report

Static analysis result for SHA-256 68777c699bddfe91…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 19:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aebcddf49c44e439ab4c89239600a051 SHA-1: 737870b451d936c45399de456898aafae2a60f80 SHA-256: 68777c699bddfe91bf471b1545ace04c21263b2255b575a40bd529053fd6a1e3
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URI indicators and link farm heuristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tokyoto.pl/UserFiles/file/60139883015.pdf In PDF document text
    • http://servicedental.it/userfiles/files/80888698785.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/18096070530.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/74031508429.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd0e55e068---xipurijidinofubumituvop.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/28328510161.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/69485884864.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zozobijatitubumozebesa.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210901071616_MTA0ODM5MDk4OTM=.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/kenerulexemoj.pdfIn PDF document text
    • https://andana.us/files/files/53564004083.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e88ced84264ee9ee69bcbdb6ecb0eff2/42383091779.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/wofoz.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/bojavimoxomojolilibal.pdfIn PDF document text
    • http://neteyes.eu/editor_up/1600181574.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wasubupilirokusuzo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/legubopimujifetuxiwuku.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/22199341405.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/41774641706.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/54193021195.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/99067887551.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/sawujuxizopavixenadufe.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614bae90d94cf---natiguxitovaz.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/xezarimebekurebod.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/pukalogaxiwed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+mortal+kombat+x+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_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10520 bytes
SHA-256: af6777c9b269f01dd01a203ef3bfb71784070be950a56a63e5f716a750627ba9
font_02_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 18628 bytes
SHA-256: a32092019cbe2ad7ce9c3d311173b490a392d9b07ea8caa32db956f3a3ededc0

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