Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7271a3592a9544e…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 23:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 947dd56e5da89b53f34139b8e1dc328b SHA-1: 6e14f4484f0de0c2e8db9b5dff8b62be96b79d6f SHA-256: b7271a3592a9544e5ff619b9095e0239098357a0528550b221a9914aeb3faf87
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests it is designed to redirect users to potentially harmful content or exploit kits. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070896702458---jemulosu.pdf
    • http://akcjonariusz.com/UserFiles/file/laponogomopinazurimitum.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/65583245248.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/n0u37ruja5vg10itrjc9879mkh/29289591533.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adeffe30947---25696889287.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16098f66841e5d---wikexima.pdf
    • https://dallaslandscapedesign.com/media/files/91750154321.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e68f56f345---zirejuvibojumilak.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/gke0mkf0v4oqf3t5m5i5r0bhi4/luxezukuluvesuvuxolafif.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/dc7b76e96240ab699101433380da2653/72473804336.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff6c22da3---farujof.pdf
    • http://malagi.pl/user-files/fck/file/jiwowaru.pdf
    • http://atthaya.com/file_media/file_image/file/penuvomivebibafekovo.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc9ac7d32---1303352059.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2210922b---turopix.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d560ae142ef0b9c3c547130b783abc08/98504630181.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22c9994fd---57353029205.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b36c3b96806---fozuxefujase.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/8495518891.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6b6d9551e9f9e797062b50e10295ea3d/91394309372.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/39a578977c799541a8416ac71f765040/weremepoba.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b339c78d---posufudelobor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=english+to+old+persian
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f642.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
font_01_sfnt_off00010e54.bin
200fc94d170de07edb573061e788a2cc031a61be0cf7bcab51c3a39d686d405f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 17420 bytes
font_02_sfnt_off00013ba2.bin
ad1e46e7a4311bbed1062de642a94fda6e7723e98a3ef98a116f06c361e89560
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 10656 bytes