Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25dfc8d2ff04373…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 16:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 255e8ee12784f362da8fcb83becbb25b SHA-1: 9ba63ee2caebcf69d18d5a4c80bc67332ef8e22a SHA-256: e25dfc8d2ff043737f3d6778eb60991aba6d427d94fa9f8445192d4695902369
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=mitose+et+m%C3%A9iose+pdf PDF link annotation
    • https://regiefranchet.fr/userfiles/files/34337724343.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/59712396592.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/14255821669.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/fojedapotonopanexo.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/27350018093.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/96090548769.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/ligisolunosojagudi.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/jawife.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/bomurimemofapurobim.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210901221957_n4pju6.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2792b9f8ca2f2eb3618df10ef6f8f569/1817246102.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16130be663594b---68010946985.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349bfe12068---48448302267.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/36099019722.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/14616614049.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2e586903---28226445631.pdfIn PDF document text
    • https://qnzar.com/files/junizesedazotipapubid.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/nasilojolasit.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/raririmitibekufarekosediz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161375cff97de4---jefevaw.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/48573450391.pdfIn PDF document text
    • http://licausi.it/userfiles/files/napazilixodiniviluwal.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/3789982610.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/41728863314.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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 18320 bytes
SHA-256: 67654ea56f48d6feb5acb6a36a1126663850dbbd09a0c9f64f0a6a956315a15d
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 10392 bytes
SHA-256: 212f1be68e01d6b1d60ea0faabbd374071d8352316d92870dbb253295f11d2ba
font_02_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1