Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e9c4d436729477…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 21:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8cd38f315a9c0ef50bc5f97c7d7a862 SHA-1: f0180cea8361b591a2bec92184d812d5d6bcab5e SHA-256: c9e9c4d436729477b406f3f23b85e6fa39eaf0930b470d0df69911056181bca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=how+to+add+picture+to+home+screen+android PDF link annotation
    • http://dalieuht.com/app/webroot/uploads/files/tizisevodoxa.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/jubovusibaxez.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/virulizavizisinopukexudu.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/52512134342.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210908092442.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2229638d5---16186682833.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/fitedetoridekovas.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/55788694116.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43368279823.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/kilunetebemuzi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb97f267b---sizume.pdfIn PDF document text
    • https://ysh.my/userfiles/file/rinajiforejameragisunawo.pdfIn PDF document text
    • https://remini.hu/userfiles/file/77021697521.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396dc060e2---viguto.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a690ec43847cfcd8613db8fe5fedf4e1/kenobe.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/moradetulumenizexe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48a4cd87e---62185586079.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/jowedanagufisiredatakozof.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f7cbf016---5287428354.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/10944502352.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613449afc8949---waxivirazanitujo.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/juboxemewinaf.pdfIn PDF document text
    • http://etre-belle.su/images/file/maxalik.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/90126426486.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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 10912 bytes
SHA-256: 7df3202c7a7c37975073624e9912fa18322e90c740aa52d3879c544b1151930e
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 17628 bytes
SHA-256: 4b4a6357b956154929203827036a9b13b6caa6da9a8ea1fe3eed26291264145b
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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