Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e3689673dc5811…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 06:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e17ce647f58a65737641f8c5fcdf95b0 SHA-1: be01a89e1e34cbb9577253485239fdf09320bb41 SHA-256: f3e3689673dc5811ef9357937b816bd484736406a9fcdc8f2f70edfcb9fb2d4c
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to these external sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=wordscapes+cheat+level+1162 PDF link annotation
    • https://seikai.jp/free_images/files/80353126583.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/24f89b3f67e60977e760d833cdcf058a/75730257496.pdfIn PDF document text
    • https://atl-50.com/files/file/89036475764.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086f69871be3---sinokegofebujibekof.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/81461261776.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/juwufukuvubom.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2d4db82e---pikikosisigigul.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5b3a561fe5b989b4458a41f2afb5a986/59379949727.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a5ccb02773590df8b633795ae7148b5f/47174355135.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/32350241653.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8075534635---pisefoporekele.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc845d9eec---9067919771.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/22719619173.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7c9946f7c6718cd04fe96f430d628267/jowanifaxakijasojupi.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/bevawemebonabol.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/kasujit.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/sabegigasukifip.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/65425998794.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60039123f---85207430372.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/39278939787.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/73083857907.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de07b2cfcf---zavoroju.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07d2b266cd---konex.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b836b349999---26964085196.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///ruwiwovu.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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 10816 bytes
SHA-256: a08ed59f5e6566fbe91bd0d28bbf6887c54c7013ede1624ca8d823ea1642afd8
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16844 bytes
SHA-256: 01e144d5bcc9c5a00ac034c3cb179a53ee8a02177735cbf1d65e55edfbe67b66

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