Malicious PDF — malware analysis report

Static analysis result for SHA-256 674497692242365d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 20:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 509465c680dbace4e5cea7d4a041e6cd SHA-1: b485606068aeb1a7d039c6f1fb15a205d842adf8 SHA-256: 674497692242365d36a28819c2bbbfa060c20d2f21d769106c33449b5139be9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads, strongly suggests a link farm designed to redirect users to malicious content. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://muzpony.de/obrazki/file/47834480501.pdf In PDF document text
    • https://ans5680.preneed91.com/upload/files/74603749367.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/juvaveveratu.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/34979258335.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kolivero.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/1684860060.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/denisowitox.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161408e5a9d50f---53083702270.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/14203810840.pdfIn PDF document text
    • http://salwex.hu/file/60852253408.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/18930225833.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zotobakagadowoxikasobira.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/88352982249.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/46545385971.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/zizomuforudivun.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/32548030496.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/vapadarenofov.pdfIn PDF document text
    • https://geniodelweb.com/file/49643778888.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/witabupuxoxabupuwakepa.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/damubop.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409ecce58c---fetipolekowixofap.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/k82t0fa8mnl36pch96nsg61ah0/44121957124.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/xasowasoziwutametu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=faug+game+download+apkPDF 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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 18272 bytes
SHA-256: 539d26fa93329b1223cb9be6acb892a4fbac5ab1c0bae0f76aeda172631269cf
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 10532 bytes
SHA-256: 0bced4506187aa1d881ed08b6626b7ded0b39e23737fa3bbd9f0ce4afba92c46