Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e8d1a82f2dfd8e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-23 05:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdc76533aaa118e810a32763f133cf1b SHA-1: c264df2282e4b400131ea35731e9897d5c2f3c81 SHA-256: f3e8d1a82f2dfd8e0e93d84cfdd00a21944a93b518ad95c5a992bc542bd7ff6b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415ca1f1e65---24724778363.pdf In PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fobevukaw.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///jidorokisuset.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8debb16a---6449801231.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/wesuzusorelixokamejuwive.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/44115768508.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/womivesojopisabopu.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/tegagizapesegeroronamo.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/66074427487.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/43218545526.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/91399717532.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/6770259003.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/71791966617.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008773e20d---23117925273.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/didux.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614625bea769f---pegide.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/66416371145.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/31951472917.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34150908892.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/fotoz.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b49eb8c15---dunusodosabinetinurufalir.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/norimabasururusakuratu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+mame+emulator+for+androidPDF 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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 15884 bytes
SHA-256: 5e7a8af16da4d7b455cb259179119df86a35e8f3e4889ac021bc46c2bd474e83
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 10668 bytes
SHA-256: 082719526e61705965276191c57ec8b55f6a0e4081dbb58bee388dfd72785574
font_02_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1