Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d43a58426a7776…

MALICIOUS

PDF

83.1 KB Created: 2021-07-08 12:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b562e4d36210cd3d5650bfd614643e91 SHA-1: 885ee5fb5682ee923e196d540a13b9aa6879b252 SHA-256: f5d43a58426a7776bf09590e5ff253b10f021e0b3f2ba2e9e6a017903bd64c36
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The primary heuristic indicates a high likelihood of maliciousness, with the document likely serving as a lure to a malicious site or for SEO manipulation. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=compound+probability+problems+with+answers PDF link annotation
    • http://steelbo.com/uploads/admins/u0/files/20210708054756.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce719659cd---29227225328.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160897877e64b1---fapijesunixapunifok.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/65ede12eb4a20ee0ba87bd3757bb08d5/xizame.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/be153943d93997a9f4237fa20e4c7d12/85962071848.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e4f1b038a24769945c7b92584ad01b01/dugavolapoguvetim.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f46580752---bekipifotipenokidonosaf.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a1121766d3e0338cff4d2fafa0e70092/nesaluwaxipezan.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/11822378674.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f141e073d8a7aac19694934008780554/tepom.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/60398495546.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed63de02da---86640326788.pdfIn PDF document text
    • https://sy-tech.eu/file/pafikaz.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/gurufo.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/99114386442.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1705a669e---94795469583.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/26492663719.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/42425057212.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c16c08ec2c6066f69298ab9fc57369e9/temowadi.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/83524478175.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/3069887141.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/10181009420.pdfIn PDF document text
    • 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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 11128 bytes
SHA-256: 10608b69e9e52e9a7b9b17097a3992ab11eb55e6d2b156c2baff7acf6b774847
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 17304 bytes
SHA-256: 8d8679d2436338f6178a8bae2f7dfe51e861fb6458bff0a0e5a0c19e11398410

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