Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf91a08b66b01a20…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 08:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e885db9bd4f69ddc425ea792563731f6 SHA-1: eef8868c4d0c94ce2f2db0e9eff6106fdf0d0e72 SHA-256: cf91a08b66b01a20d23e9fffd1de2a9256512de662a50703ae5765d9452ba93b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. While no explicit script was extracted, the PDF structure and link farm behavior are common for distributing second-stage payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nkakqjlofojad0k4pm9kk4gi84/monudumekud.pdf In PDF document text
    • http://nature-revive.org/files/file/51101657343.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e268bed9c8cf8ba122e8cea5de78f854/3052612587.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/nejuwugitinekesutifires.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/vivizofuza.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210803053520_jw0wpv.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc248bdd9ed---dibuzudoridigubujexas.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/37068669331.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc997e39a34---40902562237.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/gepiwalusamitesojodajatu.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/51562185828.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/48055264955.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vasadiginiwose.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/53878331558.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/rativifuvofiluzaludeg.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/pitegupavexiduguji.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uhj68va7m676sp27b25dpfu140/xatefimezet.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7296f3dd7bf4a5610dc60eca02f05e5/51170138483.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/13b1a4200750aa312fb85f114ca7eab8/lozapawebemudefedekisap.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/45dfafeb274b6398b801579f067ee1a5/jelimapefifazu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bekujupuwamalu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/96f14e3066eba57e6719101876f4695f/44311252059.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/99162925432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=code+rousseau+2019+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978e5bac3---48207261629.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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 17980 bytes
SHA-256: 14f107af183cb5c88e75af5eeb5f43a23b0f0cadbc84ab12ff3a72e222978086
font_02_sfnt_off00011d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 10744 bytes
SHA-256: 6c133a4f71f6c9cd8da5d627158f9afd4cef7dc89fe0ff50a1e17b33784241e7

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