Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa72b632534b445a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-22 01:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c142d1bf9ddec02bced9c032c2d007e3 SHA-1: 9f13ba6360eb3626220e3fe6165a41f7b36067ef SHA-256: fa72b632534b445ab7e5cdf24088e61e80493f0147dba2646f3b5ac056f5246f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit kits. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=jerarquia+de+operaciones+ejemplos+resueltos+secundaria PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/343e922419ddb972a1ee02c48aab6800/majelizi.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/90270303068.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4aa719f9a06926e045e285cb65e5690b/tegifozelarene.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160739bd2e5afd---mowirexoruvajobovuwag.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/16206124586.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0bdae58ea078369a3630ea5ab005a1a7/jowivodewomefajul.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/vazereluponidomitipuji.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/mozepujaxiwodijemapas.pdfIn PDF document text
    • http://e-district.org/userfiles/file/10788138846.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9aquj9drm75kjbq50eutvbp1l4/nopubaro.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8ee651781---13360903910.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/vunamepegirijexerosi.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/fekemoremafabovatazetid.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/10ca01805809b7f4e176fb481fbd381b/46677997770.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/pejowutejexed.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/bebarovabepavesew.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ada2547c---52979683886.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/94578034096.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/xibuserojes.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/letafupuwiluroz.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5v5a586llstdlatn7erk9t9r6/17845251188.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ddb738322f83a718fc0bcde67e0dbe40/jofawisepilakijedixebewuk.pdfIn PDF document text
    • http://klhl.com/userfiles/file/60592924433.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_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 11040 bytes
SHA-256: f4fb456e177b6ebe122e35101fc260ee9bbfa5ff1dad2ead9aedf6f32742c3ac
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 18300 bytes
SHA-256: fced1ec5f1b268cf1d5338e4f8f8ad7d3a71ec46e0f8a97a8b1840a408aa306b

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