Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f146348a06c27b9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 12:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea0b13c4817e762e7b2b8b941f088735 SHA-1: c4b735d515ca14faa6ed837e171e79c1579de54e SHA-256: 7f146348a06c27b9b6f1ad1d6e6ba8c41c03f92404421cfe35c0b0ddfb5524b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147bfa528d48---tuvovajapiresonodi.pdf In PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/90810211917.pdfIn PDF document text
    • https://sambelteri.com/contents/files/lakokusijefelexosaxa.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/21382992809.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/sikim.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/94050806518.pdfIn PDF document text
    • http://bakoca.hu/files/file/90533501082.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/81918317020.pdfIn PDF document text
    • https://akconta.com/uploads/files/84822950465.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/desodeme.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/31805747470.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/guxofatirixiwexupokulu.pdfIn PDF document text
    • http://faradbox.pl/files/file/21986283988.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/45205608718.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8fd8ce90---zapidoveveliwaxifizap.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4f91b18556219f6349c313e68002a23a/30196835857.pdfIn PDF document text
    • https://tmtteks.com/files/risef.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/xutedolubetesofa.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/85470942893.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/51163417140.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/zesulemazajexutakuzirup.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0fa1b885---meberidesewedeleragas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=open+dmg+file+on+androidPDF 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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 10600 bytes
SHA-256: 9b8ba678b3aece5b64d35a65cb4613026495d467c02e1aa0069b53ea6a726160
font_01_sfnt_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 19036 bytes
SHA-256: 866f40717902547df5d7aa254266fdad9c3330e138e1765d3079e4743ec35937

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