Malicious PDF — malware analysis report

Static analysis result for SHA-256 5937f104562cb8d9…

MALICIOUS

PDF

97.2 KB Created: 2021-09-14 09:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a07ede7dc8b4962b5ec202906ab5788f SHA-1: ac25190d399208fa79831f40df0af7050ed350e1 SHA-256: 5937f104562cb8d997f247b1af3e0abe21f23fb74d16e2c8f87080b685323e9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://queure.ru/uplcv?utm_term=how+to+keep+apps+in+sd+card PDF link annotation
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b142aeea51b26e35da6e835b0275cea4/23624308722.pdfIn PDF document text
    • https://produse-zilan.ro/files/20583927527.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/58797699084.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/85952569163.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/tasafulodiwuvazimedena.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/90265609257.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb69725a5---3602517877.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/41046480383.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/12753888640.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/jovixafisojirexo.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/8658186373.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/57333873390.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109040047429234.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371e11abd91---70859978639.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/zijazumifikufiked.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/kotukowurapo.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/xekavadojerevejaba.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/5052307471.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/19809736467.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/sewewemajobagejor.pdfIn PDF document text
    • http://lovesenergy.com/file/mawomewivadu.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/jinebimiwigen.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/fodagezidafupivudo.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/povilaxufukudatelagipa.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/duvoxixeliwal.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mumavaw.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_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 18516 bytes
SHA-256: 9b6f810cbdc835011caf9d1dc06a50960b077a0f7a5fef005a0c9ba8885cab62
font_02_sfnt_off00015e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E20 10632 bytes
SHA-256: 5447fd9c999129d558a186ad2679592d4da5b0c32ef04e7b7e53cd80318c285a