Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c692d035084e404…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 14:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 129144caf42efc9d86e09d29f15d9df8 SHA-1: 52d0d0cad91d11aa5d8ec43380472b05278dfde9 SHA-256: 4c692d035084e404e51baa363b688e32ed168b548bb1fe44b6b8e93c3957ab46
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as Pdf.Phishing.Trojan. The presence of numerous unknown reputation URLs further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139bce599a1d---redukidorikulug.pdf In PDF document text
    • http://carrasvilla.es/uploads/files/raguritizavez.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/noborojomajovijixugi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04baba5bc---bosizuwaxopufidezabilus.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/911779838.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/fajofuwosopesuneximibub.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16147e7e6e67e6---17335549472.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/gavazupiteda.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/kasubiwonutekijibup.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dedoki.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/22436353826.pdfIn PDF document text
    • https://network-italia.com/file/lidubapezugafejerisa.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/26604532867.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/34129229408.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fc1b752b709e99dca56a37871bafb5a6/bejalururumejuwus.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/56913909283.pdfIn PDF document text
    • http://df-2.de/images/daten/file/wazojapewasawut.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/57164768575.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/folikesu.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/faxatuvirudefenipitigavi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143947464adb---4235616689.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b1c5882c---takujebezarumama.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/94820559407.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/ligewolepekajivomazosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dua+for+quick+health+recoveryPDF 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 17376 bytes
SHA-256: af8f0f1a26ed6b2b4a03b1b9891d7649528c934f675a3bf649685926825fd492
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10680 bytes
SHA-256: 83bd282f9e72f0b2460a43949776c9051233533cd17961803fb7fb0e149c6c6f
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1