Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec8b2b824150aab…

MALICIOUS

PDF

132.2 KB Created: 2021-09-06 19:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56b801df65d23aec35d0fb46d0ec7bac SHA-1: 4c5337423342e14ab25af22d38de5a85fee3aa2b SHA-256: 4ec8b2b824150aaba56002f0eb31d1fc0a2dfaca9f1d4f3f0a601d06c56ea37e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=hvac+wiring+diagrams+troubleshooting+pdf PDF link annotation
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/77884670482.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094a67a27291---zupinozavavoxofememon.pdfIn PDF document text
    • http://hms31.ru/img/file/poputuxuvupavatojetepop.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/wudibotufexe.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/8637392017.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/lixanovawepepatevilefavoz.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c37204c4d5d---76032571878.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31516914932.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7sjcgpbj7bj8h95d7uv0bnjv63/29361970618.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612b693a6aa2f---5589883204.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/povupel.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/dodurusare.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/37806596319.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106121701061492.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/bipifepixodago.pdfIn PDF document text
    • http://museeducuir.org/upload/files/litubopomaxovutede.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160809ad607f7a---famepeto.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a089bffb---76139556605.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nutilavure.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca70df3df---fulovazerewinagefuf.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/54665832502.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/jivuvilumawexozurum.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a979ce29---besokusurexoga.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd66a7ba1a---77476519011.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_off00019ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6B7 11448 bytes
SHA-256: 35bf9eaca626114aa52c12fac6ac880019b8b27c8d844041f41084cbf1656248
font_02_sfnt_off0001d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D12D 18640 bytes
SHA-256: 1aba0de5fd76aa992c1d75712904508a9a7a69f4e78ac9bb58442263451d7be9

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