Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a090938408bb94…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 06:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af8b6b48d44aaff5bdd1d84b297c52c8 SHA-1: b22868a365ef2b6a5b418cd8ac24db216535c0f4 SHA-256: d3a090938408bb947baff6b7e73fcb1e0a5b04eb0b756a2de67de103b5f1fa00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://halead.com/uploadfile/1632628900.pdf In PDF document text
    • https://highlander-inn.com/assets/userfiles/files/86816808830.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/81270299076.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/94848817954.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/1403018913.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ec7ee9b1ef2029486ec768dfaef1fe94/25269561761.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/fobajufaxekepupaw.pdfIn PDF document text
    • https://subhagataguesthouse.com/userfiles/file/pigakesekafumutekinonu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uof176crp8ljs6s2hbqausqrf8/72840781312.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147641bd06c6---minekafezaviwobugel.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/zuzedupobatakafudas.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/nikekosinusexexij.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/bodobudo.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/26595934577.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/46925286180.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/vatebadozomunerexe.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161324dab84d64---rabobasuwezesexu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e63071c43779e2ef2df7f189a8b1b871/gesizuvolel.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/32659003277.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/katumex.pdfIn PDF document text
    • http://sswjeans.com/files/lejowadi.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/77240849094.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zezexusabozotujajudibatu.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/wulese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=conjuring+1+tamil+dubbedPDF 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_off0000af78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 14516 bytes
SHA-256: 84ff58db0d11e17689a4bf0647a38ebe0bfe616e6de84939ebb366a38995190c
font_01_sfnt_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 10876 bytes
SHA-256: 46b8b9699bb7a4650cb223e86b52a71c0fdc3808f465ed000245f38e79ae1b8c