Malicious PDF — malware analysis report

Static analysis result for SHA-256 7041e98ba3b84140…

MALICIOUS

PDF

148.5 KB Created: 2021-07-16 03:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4039da376945e0dfe344b119030d7af5 SHA-1: b63570180690d92e363a54d8198ba26ce18c3b5f SHA-256: 7041e98ba3b841406d93b21ec549c7b10b862d1b001540d4b7bc6be904029597
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=11th+computer+science+guide+pdf PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e74ae6675---31847123995.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f788b50723793d4abd20bb20e975f806/sapewa.pdfIn PDF document text
    • http://armanetti.com/images/suledovasetanalumalufax.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/furofawufuruvedipeniz.pdfIn PDF document text
    • https://plasy.com/uploads/file/15315890821.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wevipenivuzezukopesa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d45c3391d---babosuj.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/numum.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/widizifenaf.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dfa03235---50048405557.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/78121388420.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/raxivigugunuzetawotilo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab02f92c1e---33843136569.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9b497c014897c3b1cc2772cd6e99554d/51128118932.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/sofaratimubulalugefovup.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/23017178962.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29147cc8e9---duzinenorajosisumilixaxa.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/75c06a9af96d28da66c85c7ed3f4177b/93055864838.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2dc638fab7cc104c03abff024a4c384e/14407986281.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0a6cc031---15668813297.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9689d1f923---68862812595.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C762 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_01_sfnt_off0001dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCFA 10916 bytes
SHA-256: 5fe0af185363b50d5d0b9672adcb312665616f484e2a60a196df566189122c9e
font_02_sfnt_off0001f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DF0 21220 bytes
SHA-256: bc25b40b32f16f2ca30afdabb3f2bf4e0f20f7bf3575d748bc475d509496d33b

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