Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5b30da8e048332…

MALICIOUS

PDF

93.2 KB Created: 2021-08-13 05:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a94dd79723845da47ea0653b2f9e6fa7 SHA-1: 46c04ece579043436746f2e06b5df513135568de SHA-256: 7f5b30da8e0483322352862f11c18b9495bdcc69a66e43f89bc29107d2c98fa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=proyeccion+ortogonal+dibujo+tecnico+pdf PDF link annotation
    • https://betenagro.com/sites/default/files/file/julusapubanutedixo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8cf8dd656---21127414382.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b7e9c322---soxekuxuwakinuda.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7eddb6d1---kozajonoratate.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b4aa17592e48d519a0752255fef92578/xujitomuxojavimuf.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pidolasilimerule.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/471f15337247afce4b6d89f820cc92df/98638539267.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vl464atii7f705nhv350ggkrm1/paxusu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e4a72a067e712905e6bbf943456237d3/mozemaka.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/jumusofomuwaselonozukokev.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/kedewubetoropewevivireg.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/nawekek.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/nukeronegibisofumazewasen.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/xigasozosu.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/89873367183.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0367d23ab3---lubufabaxajenobinepef.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/3362929540.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mv01csaa5vic2t43gb2heu9g44/69826886955.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/92044866101.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/gitagoxufulewaride.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e4f60d15---gujigop.pdfIn PDF document text
    • http://abnicum.com/files/file/6819429665.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210704065252_1g7xy7.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_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 11112 bytes
SHA-256: 6fe73e356c80be392fb177b1f38a7a9a53b41ba287b92994b85bf807c90f1358
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 17976 bytes
SHA-256: 67764ea895fd696444974ca7747ccf5a4053e1c035e9de3cf1393b8e26cd48bd
font_02_sfnt_off00014d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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