Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8febca5a4e03fb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 20:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 925d592958c7669ab282df3df337f749 SHA-1: 3f57c8706bfe1bf6d6849bedc2401b81819d7b14 SHA-256: 2e8febca5a4e03fb9ed947443a1526943406a5fea1a723d1b96480a80c2212e3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=x8+sandbox+update PDF link annotation
    • http://medica-brno.com/files/59328016291.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/wowivosipexiduze.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375ba2ab90e---jejejorupiwimi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/28706264624.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/16765263331.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387947a24a8---runopotimon.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/63554095164.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/zeduxupupiji.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/85632529895.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/41793633840.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d271a78ca1---tofobixu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/60e1f1a9dc7ef863eff6a68a2e264ba0/78788124696.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/xumevotosonotivezafeto.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210916003438.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/gifakiratuwogevozoke.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/kiwotikilenerutiwufiba.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/gitepiwaruvawepijalejun.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/sujit.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ttk7vtqt6269uhd475juejege/verupajuxikexazer.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/48733902163.pdfIn PDF document text
    • http://mclandpin.com/calisma2/files/uploads/83696254971.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/14940318948.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/vibigama.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/noxoxarivorirodupesofavut.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/iplaufa6i7e2s08faua9qitp75/14518794073.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45782816306.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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 10704 bytes
SHA-256: 04a3769403a5d59790a68c51eafa22b4fc21d340b7a01ece6af9a9ac33627765
font_01_sfnt_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 15072 bytes
SHA-256: f7e18528fc31d3cee123cea676273d7ffb107684e22e5b6f72951194ada2541d
font_02_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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