Malicious PDF — malware analysis report

Static analysis result for SHA-256 f953068de8060884…

MALICIOUS

PDF

80.8 KB Created: 2021-08-27 11:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8794d9b1e307ae89b4130e16d4ebb337 SHA-1: 6752fff0870e7ad0cd4c1f968a283b80d8463745 SHA-256: f953068de80608840d7da6138122be49db97850cb860619feb8fa688984575d1
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various websites. Several heuristics indicate that this PDF is a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/fga1i0grmj2d16n5r2ir3tbr11/medixumojugaraputatotegaf.pdf In PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/ragafuwobis.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/kigazafat.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/73122071113.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/vufitipelakixowoz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160862220a2d29---fuvasimirekedipelebis.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/50089202864.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/alfo13as29hqff5d5jb24k7ch6/17381865968.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/12700612613.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/77200363845.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/renotupegar.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/15856523481.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b769c56606e---97634521726.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/9233216658.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891cb6ed9e4---68166792715.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/xuwojaratib.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/piwijomotitebesopofajen.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/87727732016.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160872278bd843---8315550068.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160740631b318d---89094672820.pdfIn PDF document text
    • https://mangallagn.com/images/file/15192340262.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/32365319535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=wilderless+game+for+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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 10592 bytes
SHA-256: 9b506d88d19362fc647371f283addbb6ee454c224f440474c139d95c29246a28
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16328 bytes
SHA-256: 8130bb02acd0b74e75f48a73a39c4ec908852591120144157c1b26385d792cd4
font_02_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1