Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3bb24a1fdae8d0…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 14:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93af6693a543006ca98eadb56ea5827a SHA-1: 6bf227227ad02369376253c59d1b07cd415bcc06 SHA-256: 7f3bb24a1fdae8d0cdeaefd46545b81c879414097b64e74e135825b434f77d32
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=limits+of+exponential+functions+worksheet+with+answers+pdf PDF link annotation
    • http://transbur.ru/admin/ckfinder/userfiles/files/14084831919.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4snd5vpvusithsvv2cc8gto0g4/24776575005.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8ef6d4344---maxotetatofupamawiv.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1584b6c2---kaxapabafarelazerimun.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/jubozer.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084224c8631c---31342989682.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d44133a3---42677185039.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c15716f33d2bbe6433135acd19820c5c/43216169014.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/131672617360c56aa03d0a7.pdfIn PDF document text
    • http://ruresept.ru/files/file/34733595650.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/fuxipapoxixalakegomeki.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ptmrfj0br6e81d145vvgv2ecbt/1026757830.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160769448ccb4f---jivuwumater.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/punuratilajobo.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/rusabuxefuw.pdfIn PDF document text
    • https://mfdesign.hu/files/file/77688612287.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeaccf28c3---bugodiruvidodelug.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083de63d2d84---pelaramovu.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/21afac5721a2e3518cf03de160cb2db6/feneleze.pdfIn PDF document text
    • https://soechi.id/userfiles/file/90515346976.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/murawi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5bceb82e2---ropomeworugememipu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df10fd9e29---bizusukolanewoneno.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/63149946739.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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16724 bytes
SHA-256: f583404fb9859e462c6289fa3435a9093a86e62a2cdf0c8911b52724feb5c3db
font_01_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 11224 bytes
SHA-256: 1e258b715a0d2c785514a0375dd50a93709870100f067fc271d6c8969bd685f8
font_02_sfnt_off00013fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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