Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f455fd811aae578…

MALICIOUS

PDF

75.9 KB Created: 2021-09-10 17:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6223f547d05630e777c243a6ba7b760c SHA-1: 3a59bd59dec15a4c40f79976d391efa07cd16508 SHA-256: 1f455fd811aae5787a834ae607a0ffadb58b4eaac9c1b3697ba674ca3ea9d919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, 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 document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8fea1ee6---63098075153.pdf In PDF document text
    • http://t-cso.com/upload/file_folder/file/67419593157.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/52041557905.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/76322626268.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/dugojesilojidabaw.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b505ed01d805e08cd1e738d260b7d582/81381575546.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/97498991758.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/lebuzebitedowefufererula.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/18883336980.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/erb45m3r9993j71m85soimbolm/juxilezezozeza.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/lidurikuvijitorogetinojev.pdfIn PDF document text
    • http://rem-proekt.com/f/file/depexikoxudito.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/gipokomalu.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/84835626079.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/3765475674.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/99957095815.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/51361528262.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nufoxiduwaj.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/sojuzowureka.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/luwapozavitulivodoz.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/23034322303.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/piponofofavidogix.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bubajeki.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rr0psafhs2ji218ha338f4foei/selazebitevejeweber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gauntlet+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_off0000c5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C3 17388 bytes
SHA-256: d1b49497ba65c57e1cd9b579dff78ff51916601a1c7733f79a64d265b01d6453
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 10320 bytes
SHA-256: b96a3a0d2ce9126bce71e45612be228692bfd6e4ad9fb45056b0dba1cbcc6be6
font_02_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1