Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bbf5d00f0e3694…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 21:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97a5e7f84985389a8627c51758408835 SHA-1: 19305985e77938e24b54d2c89c18bdd14b14cf21 SHA-256: 36bbf5d00f0e36941bf3107d0802214f7395030b3530ead6d5a760290500a4e1
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farm heuristics suggests the document's primary purpose is to lure users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://infrive.ru/uplcv?utm_term=trista+and+ryan+sutter+today
    • https://dalilak1.com/userfiles/file/zariv.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a65a13aec---xixoduzugajitivanuvumo.pdf
    • http://quickvideo.nl/userfiles/file/37019993602.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607197642002d---75928505151.pdf
    • http://creatinglifeoptions.com/userfiles/files/kubadebux.pdf
    • http://shriadinathbank.com/uploads/wulezobuvokebirev.pdf
    • http://fzsvybbs.at/userfiles/file/lofub.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a618fb2b042---63454958476.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/75582324638.pdf
    • http://www.kickcommerce.com/userfiles/file/winataditatelutukezosiri.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e618f21a4---nomipiwirixepowob.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3r1stqh99lqrmpevefbgft5hqp/42943466774.pdf
    • http://soft-pro.hr/upload/datoteke/vizuragis.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tue4d644t3opqtd2d1b2rh85vn/42239911995.pdf
    • https://hotellemaritime.com/hotel/upload/files/300224498.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/80636874277.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea97394690---40124503204.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dt7mh0cmpgvu9gf45l48t3kmu7/luwemunuzufibaxan.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3427a83edc---78173030854.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uojj4389f949g69hsfkh13alt7/rajobosif.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e4b9af1c---sisolawixozikuzelizimosur.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/347fe5215564b20953049e91bea5dca3/38973883027.pdf
    • http://homenet-spb.ru/userfiles/file/74217411633.pdf
    • http://www.nomorcantikjoss.com/file/guzawenifadore.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90ec5a7c2---99968605981.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f126.bin
75233c5f12bc1e316ec071f7989514c8660b0e53b9f52df3701cac562ac4c25e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 18012 bytes
font_01_sfnt_off0001203a.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16164 bytes
font_02_sfnt_off000135b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B0 16792 bytes
font_03_sfnt_off00014dc7.bin
2eb56f1b81d66ac65d39ede73b52552ee8990f7a3fe2ef55c43440044089e76d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC7 10372 bytes