Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d4ee2282616db2…

MALICIOUS

PDF

91.0 KB Created: 2021-09-01 07:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0b691fe4c7bb9f0e5a8c9307e608f99 SHA-1: f74dc00b686718cab1df189c512956e6c860a52d SHA-256: 93d4ee2282616db2bdd28bdec20fdc6ae16184a9e9225c041f45431d5566716f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and other disposable hosting. The embedded URLs, such as http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16082a72232f96---7643594846.pdf, are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16082a72232f96---7643594846.pdf In PDF document text
    • https://rireenfrance.com/images/upload/files/gafiluvufuvakanid.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kezaronirawo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67f9f0c026---11004580618.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/59082988702.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jixelizuvatalamufulonezel.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/sadakifoxuxepen.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/74027714809.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/19103431643.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8e444964e8f9188b3bbce00497e1f4ae/sidenewodipejor.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/18412564665.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/33f9006ef390239c22065509167ad8fb/vuxabodarifaxululonone.pdfIn PDF document text
    • https://aneri12.eu/res/file/94928548874.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5v6f6dt5ajqbv989e37up81jre/37127773446.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870b8fb9d95---nebufumeribubir.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/85440317185.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/92120009430.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/r5ldoi4dkh72e2559b5f8cea8o/80088044063.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hcoebe91bf8r9cgfp34tl0qu9g/26829005835.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c9c92750---8370368880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=letsview+for+windowsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 10248 bytes
SHA-256: 8ac758a4783e28e88d812c7d18723f94840abfd4bc5d47f2a351373ac92f5157
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 17012 bytes
SHA-256: e639374851f83f4c07821a40f203666043984d3b91aeb7a0f48dcda86ea59cef
font_02_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14640 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068

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