Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6e0c36c95d8a5d…

MALICIOUS

PDF

92.5 KB Created: 2021-09-16 23:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d53ca91cca6185d2bce4445494ba820a SHA-1: 858f0d12c182a1faafb81e26619888df0d77a002 SHA-256: 7a6e0c36c95d8a5d47328d45b99163935eefe9cdfb924072e2d2c6cf6f84f771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this malicious intent. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://nomylo.ru/uplcv?utm_term=loveyatri+full+movie+online PDF link annotation
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4ef9ca0fd---mofonulugow.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/98620398803.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/temoxazuvonefezipigevob.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164353b9b4---ziwobabul.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/ganaj.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/posokikadixonemili.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/xebenigujegofu.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/42687901938.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/rozimezezarefifumawuf.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/83382806012.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zerumukawa.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/nifumesurajoge.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/wolibogiguzugunaxuzotu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9cqosu6ac9rufebfhaj6plt6i9/miwukexobonu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/borikanusivepoluw.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1078425908613e930da869a.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/71558331205.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/40834839055.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8ec6817870c291d1c5ae4b4a99eb802d/mumuxeneril.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0o12pup9cfqoo2tqrno6bq66ku/3817823540.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/vixikejimab.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/26746293016.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/efeaa305904886a090db0bc3afffa63b/83752401717.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210901110842.pdfIn PDF document text
    • https://33mobility.net/uploads/files/toguzavegewomalupude.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/gapezivoz.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_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10444 bytes
SHA-256: db589ad35a16ba1468ba2ce9dec080f7c74d09481ba0f73ecffcd7e9f630fac7
font_01_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 17228 bytes
SHA-256: c725f83f8b56f5c8964267d19bf20bd1e348926bf01307697df123fcc850f509
font_02_sfnt_off00014bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1