Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66575553bed3840…

MALICIOUS

PDF

72.3 KB Created: 2021-09-30 19:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d06e694db8b42ac196e2505e57ea5170 SHA-1: d0a05b31d5a59338524c5e3975b12ac608b6f7ea SHA-256: a66575553bed384057cde27a2d6693970fcc8bcd636d2f993e8bf47ec3f10f3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic firings indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=vidmate+apk+download+for+android PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16153ba19bddc8---14523491908.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/nutobovupumit.pdfIn PDF document text
    • https://fishboat.hr/files/87044190776.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed108725cd---joverejudibud.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/bajumojasadufej.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gejuzebonazamaxum.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/20313065987.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/ralulotiviki.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/luxiz.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1632453860.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/83343942969.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134DEA20F34D.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/21823670681.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/25702319861.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/75548900840.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/sedazutuzopiro.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/femararogojalube.pdfIn PDF document text
    • https://dom-titan.rs/files/kixezitaxosete.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wakoraxatu.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/75887003537.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424088a4b57---varagebulapesu.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/40723125701.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/73805206651.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/81636112775.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630983827.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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 10636 bytes
SHA-256: 917d52c9d86bef322df9e8d0a9b1e717fc7760612e32c0a9c2159bfecf3ff0e3
font_01_sfnt_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 18456 bytes
SHA-256: f322e8c42d5e215487a75368063558d53f6b44f7070df675b78fadb082dcb9e3
font_02_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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