Malicious PDF — malware analysis report

Static analysis result for SHA-256 c789ceb4eed50604…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 21:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44083afdfc33ae055092f58440dbf735 SHA-1: 3dba56edf6fc2580ceb8484acf471c87c6b270cd SHA-256: c789ceb4eed50604855af602316ff1917a04aa1bd3970da758445a588a4a491e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=preschool+letter+and+number+worksheets PDF link annotation
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/vasemisuveb.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/18614661895.pdfIn PDF document text
    • http://seamacros.com/upload/file/wuwowir.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/59034790559.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106080902305674.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103933e68f50---gurovudejevokekesuf.pdfIn PDF document text
    • http://mamitobe.ru/files/file/98616089148.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/10769189461.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1v7mvhf03bqcupsor56ar01j96/wudanekivezunemiwewif.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160960f12221e1---fuwelejalizosevavosutasi.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/87389853981.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/40665851850.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/62676944970.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aafc1ab8c---dasevivewimutunek.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/66561152731.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/34027716555.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23efc4a05---39446361573.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/gevezinutog.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pokefamokejolivip.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/pilazakufifaxotegik.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/zopigaxemipitudogudus.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/89581461612.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6a20f01433d8d648c30dab6c9626c0d2/4612054780.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c16f682b544---badutavexadezewa.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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 10960 bytes
SHA-256: bdc31d0e8e3dc6664e97fc5a34bf8811317c3ca9a066d6ed5d08650ec3157d58
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16984 bytes
SHA-256: 0ba91472ca69adcfd6aa0c134339b888be59c8bec9a9c12379c2519bf9b4a870

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