Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d96c89f32eba45…

MALICIOUS

PDF

81.5 KB Created: 2021-10-09 16:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c6651a7c020d44fd38dfc9e28753507a SHA-1: 2269657807318b5ae45ed0f40b1b42df3e394b06 SHA-256: e8d96c89f32eba45aa3055f696a9b07b3b5a1773fc65681472485bb3b14d45fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS upload storage. The presence of numerous external URIs and link farms suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://turasmobilya.com/img/editor/image/file/61693249819.pdf In PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/61492078396.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fawulazanifigakewevejasuj.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/11423400942.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d2bf644411314a5f4c3b76026edda10c/vularamovalefejasaxifef.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/jexenokulojil.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5a2dc78432f165033afb7b4be28a1418/73920636785.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/94252020110.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/valoxogujokaduvewoxa.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/3008689518.pdfIn PDF document text
    • https://dcimx.com/files/40119373619.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/panoperobomibovefukijin.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/40627922095.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/xejivenusivida.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615811599d819---zewixazugefademubujaguzu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/72944415329.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/duzebupimusavuv.pdfIn PDF document text
    • https://afma.pt/site/upload/file/zawenujuzegurejafikujufup.pdfIn PDF document text
    • http://skupka54.ru/upload/m/bifevi.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/xeminero.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kuzeravimaziwo.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/96860622074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cars+fast+as+lightning+hack+downloadPDF link annotation
    • 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10832 bytes
SHA-256: 16a99ed5619457c5d1613f28119ad2f8ab870b611e123ec63d9df267a97d90f2
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 18716 bytes
SHA-256: 9ebe9aad667b70f5d1908976261dc2b6cc91b1cad874ceebb0de3e73f55b64f2
font_02_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1