Malicious PDF — malware analysis report

Static analysis result for SHA-256 504eb4a861d2a5b2…

MALICIOUS

PDF

92.2 KB Created: 2021-09-22 22:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 218976894f2702d783f13cf0745ba3b1 SHA-1: 23b1f634906d6433a737b510cfffd40a2243d541 SHA-256: 504eb4a861d2a5b2a47d111df18872da7356f10332a8862a6862e536fb7e5518
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://nada70.org/userfiles/file/49558981563.pdf In PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lafukapuzejopafekukota.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/mezokuwujudu.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/bojexawolimebu.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/xarawuniruvagonamiv.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/34136567382.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9d8me68ce9fng98mfqj376uldd/jujanivukupi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rulodudubaxutax.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/suzuji.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/29671489616.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161347fbc79ab1---tevigojirepawodedu.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/79904747681.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/68627285397.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/xopigotiduwawo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/22782022801.pdfIn PDF document text
    • https://sambelteri.com/contents/files/61096847997.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e51894d16---wibuselinumemi.pdfIn PDF document text
    • https://rcot.org/userfiles/file/4187808179.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/32998430104.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/kadakesejizemubeniviba.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/71123919690.pdfIn PDF document text
    • http://taociren.com/upload/file/2109011757214495028gcwg04mhz9a.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/45938155445.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/merajonaxetovikiwudozepi.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/fodepogiwaz.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c990bc57f4---daliviwezaxuzegufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+satanic+bible+lavey+pdfPDF link annotation
    • 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_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 18500 bytes
SHA-256: d21cd575c7083f906108e1424fb6088863feeaf6b2303733fd71d58bd23229bb
font_02_sfnt_off00014add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADD 10780 bytes
SHA-256: 39096eff7d6c218e7bba28ba0467f2e25843291e286a3ebe46a2de88ff75f30e