Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e3cdb740ba45e5…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 12:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75a3cf49c1aa9f12ee3e317c058a80ca SHA-1: 7b433438a444250228b8f4127a5d781b3832b37f SHA-256: 47e3cdb740ba45e56092344a53fef74d7fc0da2ab96751bad3a73b16ed8827ee
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 as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://cructi.ru/uplcv?utm_term=atypical+signs+and+symptoms+of+a+myocardial+infarction PDF link annotation
    • http://andlupa.com/userfiles/file/sawuvugonegiwepovomajom.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/fibuboxolilugu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/purakibofukiwaxa.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/rurufisunev.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d65524bbcc20a1c6a46c6ab159b37490/lilopojis.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160db209a9d349---83184718637.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/bavurenumujipajolobelisi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e30628e95---74805618796.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oj6jdhjv40e22phccs5ekg9q4j/kafovi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-5/20210605163856893875.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8a43e22ff3f05ca9e9be71388ba19631/diwadapopovu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f1f438bd---zusufisajile.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f12d29afc7---49385371856.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/60342559288.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9ae2c05d---76107853786.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/36706615843.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3c3a34c8351c47695ddfb00c3da91cec/55137570402.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c4ff0c4e---sagidesixat.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607862d6021d0---zejurotomiliranir.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/97292654184.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/a2293e03f4073db901bcbf25a6df8181/xasogemasajazup.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/vifag.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd6d07b02---4862543967.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210705_050220.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cpjhibj6rtv57i5rl0eb7i7h64/gazusozalavivinizukumep.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16246903737034.pdfIn PDF document text
    • https://sealskinz.ru/files/file/31019278857.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_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 17648 bytes
SHA-256: 70cb0f746a9c1aa988200ac8882ac9995855f9ffca221cc58b7e242eeb9cc745
font_01_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 10928 bytes
SHA-256: dcb3613adc4da8cce837e0a0c8b480514deda0a5609a6d5820362977f927647d

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