Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cabd67e4ee90750…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 23:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f2600beb5ba82dd7f4c7f630b4b4f0d SHA-1: 5ba7083e74da75018ae2f616968aec4b0b7f6470 SHA-256: 4cabd67e4ee9075098eb3c516757300ac00c1bea79514e853941bc1d99d06a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the use of disposable hosting for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://kinel-hunter.ru/upfiles/file/joziteturijane.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/54273fe8d327e86fec337bb7de41886f/91864936807.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/49532936913.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160700e2ac1cd9---4649512703.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/odp3h48fscdt2qocag6m4922aq/70010977532.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609839e42aca2---kevoxagufawewod.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9irbegqpjfma8ubqa74ul8d0ga/23663989207.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/0febbbe7d314559728de2a858f35017a/28367797557.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7g8psn52bu5dn6p0vgihmlddqj/joparodopadelikop.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/01k0rbf14hfft5f6d0jvt8l0he/75920164370.pdfIn PDF document text
    • http://www.moyekolodin.com/files/pekatawo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dfe368fffb082100947600a02aace216/70410594859.pdfIn PDF document text
    • http://gdgom.com/upload/file/210623121941855545rg1vmhlnljk5.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be71606fec1---29845301547.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/70312832777.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/10f1e1fa8f04c61fb72dabdf29bd4a86/pokodezivitolozav.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/pudabunutuwinufedagife.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/25f96788e93d60c3fc143a2aeede374c/tomagitenovubugosuweka.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/29982555667.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/6979662000.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161114982df6a0---65272554148.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e461c7e79458cba70466623818970dc2/tuwajemama.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/99933323662.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b564a55e7e426fafe38ea5320243eacf/getamilososufibafujo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210808012819.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b33813c7c---84944646691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=edictum+de+pretiis+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 16532 bytes
SHA-256: 55bf7f1b04e142352e193050eb4d8d61f389f17081109e3f4dcad9ef18be5bdc
font_01_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 10432 bytes
SHA-256: 1605d8e030a4f405870816a57ce8d4b49349440e62177ac2b30fa83da718e818

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