Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bca8fa6a0d07ec…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 05:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9492aa0de1b7ec4defa9e6de347c5fb SHA-1: f9f8b640c82bfdbe710fb0ce13fe1202b2144e7e SHA-256: 16bca8fa6a0d07ec8a33aae43e9ae764b813972b4baacd21497f630143a2a2f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of a link farm designed to direct users to potentially harmful content. No scripts were extracted, but the document's structure and URL distribution suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adepotcustom.com/UploadFiles/file/20210430182517103.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d4917d14588e08ad1fd8d242480a9e4e/96845932039.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b0c4f30466c22005c1af6d7dd4ff8ef5/kuvajovutalisakodo.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cd5861dc---sepikukekefu.pdf
    • http://biplano.eu/userfiles/files/77220344026.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/ecdc5e59d0c4a3e9f9722145191bc5ab/zepiwekuj.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b9ca2ef4e1aee79b7af7f072207cd26f/bodeliborijefofor.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607634a0ecb78---77362523774.pdf
    • https://a2designbg.com/userfiles/file/27727234236.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0mjldfa79hta440anmeri0e310/55287585342.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r3734eccf9r84gqotvs9e724rt/18989976311.pdf
    • http://bannails.com/fckeditor_userfiles/file/91131524406.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/712ec526d5c4a9be9ad34e9d32f69b1e/49862689474.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/07decf6575b4bf7a4dd16e25e56e0044/96477487711.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/agsismkfhhskv55h431c9267m2/58641533816.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/32b1c70c7eba60a87a81f6286e69a57b/wajibawuwobupidifek.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2f2c5290dd76639555673a479a50c331/65737953052.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ma1ihg5lt8kvsdetrrvfb5fv8h/lebozutemi.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4d5b41b1---vigefigomebetupebasexorem.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779c1171c52---rejupo.pdf
    • http://austria-ex.com/images/blog//file/lafagilizarikediluxe.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608faada64107---gasotakunorefozuzugofik.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a92f6ec87---suxuridasekedekubitet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=first+time+prostate+toy
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ece2373225bd1c89fd66c86c87251a26/nafinejexes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f7.bin
178cb7274adb463db84394ff992fa46fd2e31b069a94b7c6ea8cfcde8dd2206c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 10352 bytes
font_01_sfnt_off00010e6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 16792 bytes
font_02_sfnt_off0001267c.bin
edf23f361a26a34f7ca0d74f6c942221c7afecf4aae372e503c7c7c56638ec04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 17616 bytes

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