Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2770ec5d9d1963…

MALICIOUS

PDF

103.4 KB Created: 2021-08-10 04:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5146dccdc5a7dadba3bc2bd12440b187 SHA-1: c783a1434f40bdbc2e99016b6b8d2795aeb3d11d SHA-256: 8e2770ec5d9d1963075b5c0eebbf45e4ec487eca1543caeab3d2d6b0d868c678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to distribute further malicious content or phish for credentials. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to obscure the ultimate destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=efecto+mariposa+pelicula+online+latino PDF link annotation
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gdrpagpfpqjq6gidpmf7j6rktm/25486606883.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1211cc0f---13258314641.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1fb7bce7---zivude.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c869f849d88---wedefexi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f92983ddf---23823463461.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vc1c27phoir4fk5obmic9afscj/43487631142.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7868a1abb5---5997171126.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc6e279a79---vizerola.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/28b7f85b16cb7e0b35b1adaa5c435b63/76905753251.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/187ff32fcacb4e1e6d2eb3967e16d98e/jerejokepapusinisa.pdfIn PDF document text
    • https://vpmemorial.net/images/file/66978086941.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/gizarosetalos.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f33d6fa58---jajevaju.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/63532653522.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4d07a81f697c01cf83b59ad41262b009/68115064153.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/dazuwerivogoxek.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/10521131397.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/jigijaxovewogivuvejuni.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/72361841648.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5bb8b297---68620984168.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/59131464256.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/tijilabonefokizabolike.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jupumipegubilolap.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_off00012cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 18688 bytes
SHA-256: 1d9f241a055d532c5abab2e11d520f2d7110bf55506fb2732bc2ddb4443ac7f9
font_01_sfnt_off00015cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000174ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EC 10724 bytes
SHA-256: d7f70e3ece8b572adc3ffd8e89775d717fc300463f8c0bff0cbfc0c167a7929e

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