Malicious PDF — malware analysis report

Static analysis result for SHA-256 9494d47fd3299991…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 10:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75ea5d7eab296b8c5af49d0ec86e5777 SHA-1: 791ed17f36853eed5971a3d369bdb7d33e5295cf SHA-256: 9494d47fd32999911ed4623aa9b0ef3e62ea5807ae9b3b4107e4fe1a1c37c098
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa3091210---kozefid.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/45848184856.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/44652981669.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ff639d38---vizegugiwononabimumibuf.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/84198403235.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/xetopetite.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5r7hjf9rc2jfv8n8p9q9v1bmj7/televemolitu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3888ecbd---jamorowesogif.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/50698989492.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1934f711cb8e69b4dc5600c54e7fa3ef/sajapesofitubatewenoruf.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/29633420233.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/semijipekidevujomarum.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/vevemaviboredolitanifevu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/82057172853.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210511065930.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b7876ef2e1ad1e4effd9920850aeba01/datofijenedukebal.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef16bca0e---91653046211.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/44946331358.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/zawiwinuguwixebasumom.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/gemarevejaxivejufejujud.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/rigesosuvowifo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7e6844d6696bf24cdb16cf31eda3ad24/lugeliva.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/mogajabawebaza.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/vexubomifusununebilunola.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nazavisegowivukerivudari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tipos+de+sensores+de+temperatura+pdfPDF 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_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 10676 bytes
SHA-256: 08d0081aad7d6b5e16f8a1bfbd697d630f71c9f3f87d52f5af93bc41e78cebbe
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 18240 bytes
SHA-256: 16cea910a384a3aa4a8da3d08c62734f16ac4456754559f887434827d9ef7d74

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