Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7d677270cfb826…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 00:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c4ab7f11c27856271f0f00c58d31487 SHA-1: e278222087ec9c3c87c5fde20835dd1be680fd0b SHA-256: 5e7d677270cfb826c4401520f80c75c78d9a69d1514d47cef44f756f65ba6838
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=how+to+clear+cache+on+samsung+galaxy+s4 PDF link annotation
    • http://lagerunda.it/public/upload/file/9648290958.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/41564366193.pdfIn PDF document text
    • https://basisnomor.com/contents/files/467282030.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/wetafilonajivetisokiz.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/gexodowodikefibiwiva.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef882f1518---65479039488.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/rutupaxilaxokaru.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/tuvijapufuboge.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/70265849614.pdfIn PDF document text
    • http://mcutech.net/files/71340332866.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/26677612095.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/makewukut.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/23966585702.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/bilijupuzor.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/sozabi.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/ledukumosofisonewani.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/63548382825.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210911095322.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f7ab849457e3b4f1cac1d5f96a9daf64/pezexazusekilanip.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2975d90213f88c7176935b9859f3c6cb/vasunulavepezotejakakur.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/19681960919.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/66136877918.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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 17696 bytes
SHA-256: eb6da76f04eeeec4fdcabfd1c0c86ae60307dcc40a78d355702be72b647a98da
font_01_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 11056 bytes
SHA-256: c32388c4a7067c80d7132e7e9d6a9ff02377725d96ad5e6b0d7f7ac7a759cffd
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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