Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c43ff51bdfae6af…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 08:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd558f3ed0c05b54ebbb01a1b39c08a5 SHA-1: 04216493f68978184c21d0806b3612c11cc1dd93 SHA-256: 9c43ff51bdfae6afeeb7ac0de1bd5df6920ea21df4dca5640ac3d906c7560e4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=badminton+legend+mod+apk+unlimited+money PDF link annotation
    • https://barcelona-health.com/files/galeria/files/30535265255.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a21f0316e---36670144170.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111635046149.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/85179002.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/namaxi.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/84767269676.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/78910315878.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17437930903.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/27734583338.pdfIn PDF document text
    • http://wawa757.com/uploads/files/powigodigos.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/67493983118.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370823754aa---xewokivojoguxomekugalaxa.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m919id36oj6odrijml9044thd7/85882915421.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/53170111215.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b00f86b67---resevimolafumedikezufepus.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/fezenabilosowewevavirogul.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/95548072738.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xotifit.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/sifugaxobonezutagoxiveka.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_off0000ad7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7C 14996 bytes
SHA-256: 167dd36ed5bd49a5c4f0b92c0588db4d71bf41ea0e4733a025f3f0ea71e48685
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 10824 bytes
SHA-256: 038189ce656d85e051d562feb411fe58fc4dd48189eb885941b7150f1f0643b3
font_02_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1