Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cb8c6a7c2fa324…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 05:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcd356d6a0be10a2398dbad94f53b550 SHA-1: 38edb9357aaa128a05c495a1580e00396fdd1677 SHA-256: 11cb8c6a7c2fa324514f8cf8566c58dce096d61a953164046a4fcda58fb0ac5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=best+game+hacking+apps PDF link annotation
    • http://fabtur.ru/upload/files/vorizagepiwajes.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/78182831676.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g4l5ji0vjuamd31e5e9sfracm3/54013142843.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/73781634743.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/numixaremapusejoz.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ef26d562b40534e5f55e4aa96b7a4b47/fitavotoloninewodiko.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rpavirpgivrelu295ut3rdo532/54508058960.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/pexedegutipijefonamasavip.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/99370320805.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/savafisuredawefugugeg.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/75134540651.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/63304004382.pdfIn PDF document text
    • http://partnercable.com/files/81880580287.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/8243748759.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/25700606922.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bixuzileluwuniduwik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aae3ae1a6---66411153781.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4a1380de9---risozuravejeruwatirorejok.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f866bbf5ff---kidemuresemokaxunoletez.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/643225799.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a26d1cc8b9e35ea74e771f279c06b471/18869029624.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/91191130673.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/34625237525.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 17932 bytes
SHA-256: 0de5e4a3eb08b00c22b59eb94b500ed9742dedbb766f516030977c9469ea0488
font_01_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 10700 bytes
SHA-256: add2e8817f45451574367aec7e7ae3e7c5ebf60b87896c761972b82b5246bee0
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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