Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72e228a8ce93c08…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 21:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6b95992631b623dc8d9a9a6c4199669 SHA-1: 9c60edd111a40a85cf082d54addb1b308d399986 SHA-256: c72e228a8ce93c0880e77d48bc55a179a8f82bc6e500a1db1a6ee3f515f37e02
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, many of which are hosted on disposable domains or utilize formcraft plugins for file uploads, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a malicious document intended to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=compound+words+worksheet+grade+4+pdf PDF link annotation
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071757c22fa0---xubanexujeda.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e1d36b7cba0337b138b91318e1328d9b/mozuri.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/sivikon.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107180047469448.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a96093c255b---45154237526.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/nomamo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7bf8a61ee---jepip.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/kogaseto.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160834e0ed5ec1---lowibisaruvawuwedakurame.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d247ce56a4d---nijanixotipakabatam.pdfIn PDF document text
    • https://fishboat.hr/files/zuberuzuzovelozebumi.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/21220970414.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b38cad1c2a52afa8ba9ba876363399cd/18982519816.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/kadulazupijogirubixakamup.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/ravaxagujeka.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pslrqe4533990ngu92jssfpm4p/xowekurajizakiz.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1liimjsmpagv2ri6pifdctiha/76498664261.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbba28f9fe---21275246073.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/71163678285.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/sejexadarudivabasapap.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/vinawejofapozobogalevi.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/fagit.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_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 11196 bytes
SHA-256: c8fdbc3a5641f11b86fef58c0d5aeeb522e40bbb2159e99b6268998e80785264
font_01_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 17568 bytes
SHA-256: d567ade17ffb6618c333ea6157594e07f7f68b2900cf0290955692f98e269f56
font_02_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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