Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b51d127bd6dae4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 11:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 747f23e893b5e004c4f444231d6732e3 SHA-1: 9199e1545eee71199a01c3424aa44552f0e3d304 SHA-256: 20b51d127bd6dae4d2baf0bbf5d7e1f45693e2af46e335fd826e1e49a272f684
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=the+three+body+problem+free+pdf PDF link annotation
    • https://barcelonacentremedic.cat/files/galeria/files/35739996345.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/bekezini.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/58918668516.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/63018689791.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/13553345053.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1547ed30---10247847239.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/491134492.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/tobiboxiraju.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/81663186001.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/firebisurelawomi.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/sepujimefelakij.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zajavoresefiferukunamif.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613310a291a8a---figirasikizufevugimoda.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908022849.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mrpqru6sgf85gpr9cda212e6nv/6992052058.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/zevibemukot.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/55094285224.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea8c0e7fa---37798298459.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/kuxivonemin.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/97183632678.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc099586f3---fovakeriravovo.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sixixix.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bc50cf69d869871e64b6250bbc092841/lelefavitojofafepodot.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/kiwefezebu.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/45079759451.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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 16904 bytes
SHA-256: 41fd7556b1d80fa89d6e880d3db944260ae335b79f21141161c7b022cd2aa60f
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 10452 bytes
SHA-256: 175dd58b5f4e8b0af60282cbb0ed3843f45d59af1b293d7627965bf5e9bc6262

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