Malicious PDF — malware analysis report

Static analysis result for SHA-256 956fc382b31f4dda…

MALICIOUS

PDF

93.6 KB Created: 2021-07-03 08:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f223a55f74ee0efa7cfd6c4a4efdc0df SHA-1: 4e476f5c40850795c14b2333bcaeb91b3de4fb23 SHA-256: 956fc382b31f4dda05e4e7505e11a615cdb84d798ab9bf5615a310d340c87c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ao9q2m2ioatp71p4p36m7tu470/17738024750.pdf In PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/naxirit.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/togatafelutiziwi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/h2lemf6anamfivkorm807cu7i2/dixukada.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5991ef857---bumevezezipabuk.pdfIn PDF document text
    • https://lesura.net/userfiles/file/20971929188.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4a0d13a7---60890113422.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/23684545745.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/fisudofuweti.pdfIn PDF document text
    • https://jobtiara.com/files/files/dekudaxodesek.pdfIn PDF document text
    • https://agatanorek.com/files/file/22944982638.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sa5h3g3l2gnbmbte9fq8upi3lp/22999503174.pdfIn PDF document text
    • http://beliangka.com/contents//files/pekel.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/808f997d71a4bb306ebc23b4930d5650/11998465366.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6816ef4d751a339a31e5badb17c36d42/vumaxokesamafoseke.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/34277991632.pdfIn PDF document text
    • http://goref.ru/files/file/19057008208.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb77569fd6b---67008598625.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4d243a4f---fezazoputenixuduka.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17b279b33---zuguvijat.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc063449a5---lugazajav.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f1630f439707d047a6f3dc6466881bc3/30019297763.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1590b91003aa01de31d041522403807c/3827734137.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210701213107.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/nakaxogisulusile.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/85c727d8f0ccc1ab35f9de936f302438/patogigadijuxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+say+how+you+are+in+spanishPDF link annotation
    • 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_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 10596 bytes
SHA-256: 63bf2d7f618effcc96cb8cadd15d312cf539629dbc3d26350b0258ac1630e066
font_01_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 17788 bytes
SHA-256: d7e9d83bc9544becdfa7767b899f4262652034cac595994b993ee903b7bace74
font_02_sfnt_off00014fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1