Malicious PDF — malware analysis report

Static analysis result for SHA-256 317ef7e50f9d9111…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 11:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1bc6517847f6a5733bf0edf9cbefec0f SHA-1: e655d6d880f42fb99e983c48e344f95c38a2a765 SHA-256: 317ef7e50f9d91114f2cfadca746c560fe9be9f997985d3929a58cf0ad16da46
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=parler+space+apk+download+for+android PDF link annotation
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9d698251b86de2360855d6a633b1d9fb/71645059388.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/87852497360.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/tumudofabukozila.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/jubug.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/bifovoforegixoxipisesa.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/getekisimekezeloni.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/lebisuzuroxujelade.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/kukabujigubaxinuneti.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95b62121e---diderajepetukugizujefevof.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/bubekoduwebara.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/zojikix.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/vesiwelagepixogameg.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/99024381952.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/33889599774.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/23539343769.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/sizifutubazodupoze.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/wajovefi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613811450fe66---lodokumiziratapupav.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/31942977578.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/99438528219.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/28091712641.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/zusodenu.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/36953150876.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/21974421740.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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 17988 bytes
SHA-256: 2d19336a2907b56a08c9fd0101cffc6d154449a9f42ed816d23e41d1e2f32776
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 10692 bytes
SHA-256: 23d63db64f9e22a199fcb4725853fed3f5744ec72ba09e5d373b26c10ca64fa5

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