Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f989269ae8c3ee…

MALICIOUS

PDF

95.3 KB Created: 2021-08-04 02:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3a2fe63e82df6bf3a6668dcd739d1308 SHA-1: 20e03a468aa2e6c35302017c03c79d74296558d2 SHA-256: 31f989269ae8c3eeefc2892ebab9960e1db68c07122456c632760268268140f8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various websites, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://autosaloncenter.com/uploads/files/84582912363.pdf In PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee3a1362844cf757d9bbb0d5d9c445c7/fodonixifusanofakivanumes.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994329da806---96350271530.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/83387547352.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad425f817---18855659947.pdfIn PDF document text
    • http://4bx.pl/public/file/supuwepumixum.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fodawaxitifoxego.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/1785625410.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/wejakuselutajilofi.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/perig.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/tupajaza.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/r5uhi8cdurrog3gjdlorc4clqq/fufilepuroxo.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076895219163---nafos.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c377c3463e0042f11153946ce77f9a45/64475591965.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/85521309857.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/dazokatoleririludiganu.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/39508477.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ed910f584d5c99c26878e04e6f56b1a6/waleledemimodidu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/5s5gsoh1fiu2i70tg3ol5iruh7/99391838740.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d48bba35---sovifaminowolumide.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109bca857384---46454519026.pdfIn PDF document text
    • https://nevisnews.com/userfiles/dajalezixaguxebaxovajaf.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/48082760137.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/19034512469.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/25030624232.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vowujotalub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+ball+z+devolution+unblockedPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 18316 bytes
SHA-256: 2590c7fb7bb5f40210d11abb2487e5377601a31b951b9692a67385b1a743952c
font_01_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 2368 bytes
SHA-256: fc8bcce90788a3e5df9f0a7f0ff7bbab1dc5a1afac7e06014150719fe1c52da6
font_03_sfnt_off00013fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA0 10836 bytes
SHA-256: 4887d1b09d86056672b8fa496eccf8f822765be130ba6e0be986f7f02ed83441
font_04_sfnt_off0001588e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467