Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfd561bc0cb6314…

MALICIOUS

PDF

70.0 KB Created: 2021-10-11 12:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29ea9cfc1f6b62c401e1e5bc676936cc SHA-1: c07354fc93d211e16fa34d9aeefd82237ca4e8c6 SHA-256: 0cfd561bc0cb63142a367888f32f2d485301db164f641b67317dd004cb4e7cdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised CMS uploads or are part of a link farm hosted on disposable domains. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://crysiq.ru/uplcv?utm_term=is+the+iphone+8+t+waterproof PDF link annotation
    • http://agapetown.net/ckfinder/userfiles/files/74805392157.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/fopojelifukanusav.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/59192976394.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/gokarawevemulibufulotumo.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7a48dd72e0838eb889465252e14f2aa5/bibegeniwaxonegasoxuma.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/7353302317.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/marezujabawobus.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/52605268774.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2d606c28b---zowadumir.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vuretividuduraz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483c1aab0b6---piwixatigi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/kawofizojog.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/5030114107.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/wuzatizejewijeme.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/93c1c6985d63a32ae3cdcc13495829f5/39664215566.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zazibexis.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/kelewelokubimeropibukidos.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/81d7b9049b49d381e4cc2fac51905562/wonubolusi.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/dezemulasawanujevomedekog.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2m0euk63rbh4ntmrgbjdt8ohm1/fisoxadadokif.pdfIn PDF document text
    • https://norservis.com/files/files/48991947179.pdfIn PDF document text
    • http://chinalabware.es/d/files/gekimemuxasokabu.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/50196252443.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/69554986346.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2bf8e896c---lujesukafiwokobefofese.pdfIn PDF document text
    • https://bolahijau.com/contents/files/fajasuteju.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_off0000b443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 10656 bytes
SHA-256: df4e2bdcd95fe1f3816ef594c093256de6aec513268ec628b5170d2a586bf461
font_02_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 14892 bytes
SHA-256: 45f18d8b72ad0d0b4b249c97b46cab4ca35fdee6f1b5c134d7b490a3697b94aa

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