Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab7c373cd59b1d8…

MALICIOUS

PDF

238.0 KB Created: 2021-06-20 04:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31d79eec17ca8b8c19fecf84449972de SHA-1: 76697a9fc750f8c964e487258eea83f6d0843fbf SHA-256: aab7c373cd59b1d89db0e74f5ad203e16205c707ce373e2fb22bd9e96b1cb849
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160743aac00e4e---2777684145.pdf In PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/95140378310.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/766eoqka1tkqn51ttfjbdpsgs5/71775992482.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe7117b9a0---nirawixubud.pdfIn PDF document text
    • https://kham.vn/userfiles/file/dovakakejuxakelapapuvera.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe55575be---21980445938.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160905ebd1f819---vixodudomugasofovigopep.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b1e0c6d3---zikaxejokugolewotumovuxe.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/zegitapazedaxigo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0fe6e885---dawuzimanoxofel.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8c8dd4abfbbeb940a2e058a7f34750fa/xobixilezimilesuf.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mejotiwali.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/24857804612.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6c791d534---pugopubinibuzal.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ce90fac758b---96904468957.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/tikugis.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5b4e4f08---pexoro.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/22759613380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=meet+innocence+at+kitava%2527s+hornsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36FCF 5020 bytes
SHA-256: 7b6f4b8d047cc1d50b6b91724f7185a0324ea461a34fa16fdf3dbdbceed3eac8
font_01_sfnt_off000380f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x380F9 11928 bytes
SHA-256: 908dbe1977cccb725bd304d61ecf94733b5437d99df586a6fa67b6e4c2cec2fe

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