Malicious PDF — malware analysis report

Static analysis result for SHA-256 74de9f1f82564e0e…

MALICIOUS

PDF

81.7 KB Created: 2021-07-18 15:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b814d006b2270726d5b664b6b474d90 SHA-1: 9ebe4cfa38dd39333017f48ce61f49e9c27fae6e SHA-256: 74de9f1f82564e0e66190704d470e96768dc811ee42f1347b9c9df4e3649e752
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicates malicious intent, and the presence of numerous links and the 'Download Button' heuristic support a lure-based attack pattern. No scripts were extracted, but the overall structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://burattinojatek.hu/userfiles/file/sobojuzev.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/75748248258.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081093db3f0d---fafuzawomikevamojitome.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b3c37fba5---11138166606.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e74kgc5u8rnhmgau67nvd2tnb5/69563226774.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/205e55c37f1409fe3655a783419f320e/dolokesobikarajuxixotike.pdf
    • http://aucoindeshalles.fr/menu/file/mojemixavukoginagaso.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/lilapusamorupogologonili.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960d95a105a---juxuboxanodatowip.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vstijhnoqr6qhun42bni5354gj/11690013656.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbcd3ade8b---26453792628.pdf
    • http://adaviestransportltd.com/userfiles/file/porufogozux.pdf
    • http://ucity1967.com/clients/f/f9/f95c10655bf48216a4b8c8e4321ec146/File/61054216499.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40db1c5a2b---13041771834.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/21311fb0a60e575c9b1913ea262565a2/78746688837.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cf841bca---nalap.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ad834a9a1aa28754b8c1c37dedb636b9/vumaxejepivefo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d06f4e676---32701818577.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/23e78c75e3fd6b93c3d51ff92470547c/12222131688.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021713425209315.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ssc+cgl+maths+notes+pdf+in+english
    • 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_off0000d840.bin
5be5c0e483a253657020a42fe42dda438c31116c8717b377020a46668768defe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 17396 bytes
font_01_sfnt_off0001061c.bin
cf5a69b96252e5f2cd12193242112163f87143b209ec680900542c6944ed84a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 11044 bytes
font_02_sfnt_off00011f66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 16792 bytes