Malicious PDF — malware analysis report

Static analysis result for SHA-256 717c3df2f04720bf…

MALICIOUS

PDF

97.6 KB Created: 2021-09-09 07:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efb4c66bd1722bc7be18fe0ab48e0808 SHA-1: c26aff1deeed869d8a55e9238c1ccd28dc79415c SHA-256: 717c3df2f04720bfff2cf5290102d159901a7b8d71761bdd14b5199e8d7ae7c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348fdfdeafe---lirajimemexekepalibed.pdf In PDF document text
    • https://xn--psg-9lac.hu/files/files/51653732109.pdfIn PDF document text
    • http://identik.hu/editor_up/wekejaniwelopaku.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4k91h1bssgmk96ks5pqkokgimg/vasebewikar.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/kufikojijun.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/2262362954.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb2b138d5---98114243424.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/nevozuvufopaxogujujibube.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/bebunavumajug.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/lavomime.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/nalukudorixowibiwix.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/55090218113.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/tipomopazedumibugoxuxowus.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b8108df4d111bfce41d0277fe0b5eab1/xafukotukitaje.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161306d3c5cfd0---numudajabubepafixilotu.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/dorusiwisol.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///xorawafaroxejukejulowum.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/zepaborelivag.pdfIn PDF document text
    • https://kimcert.net/E/file/99215661245.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a466f1ff18c981f323d6c07e881e6b5f/wobifapavusuxudokudifafu.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/kapadajezu.pdfIn PDF document text
    • https://olterus.com/contents/files/lawon.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161393e196dd15---jomofapuxokawivuposuniso.pdfIn PDF document text
    • http://promise-land.com/upload/file/60322177372.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/16053876473.pdfIn PDF document text
    • https://tsolisp.com/files/file/xabokigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=demon+slayer+the+full+moviePDF 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_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10760 bytes
SHA-256: 7e9d99a24fb6fbda2e0db3bc442aedc8b021cdfebae9f0be3801f0edd0865502
font_01_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 23592 bytes
SHA-256: 50fe299496f66c255ef2a4042bc2bb83163df72371c2f7f678ea376c8d3a35bc

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