Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75475e7710901ee…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 00:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4370b7da885ac840e80f82adb97055b1 SHA-1: 290c319468cd1e8b812841bff065be70b2ac4ec4 SHA-256: e75475e7710901ee305e07b173c179cbb983c2cbc14f63ce4a56cd3488fa6674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://b-solutions.net/userfiles/file/14404687870.pdf In PDF document text
    • http://atallmed.com/userfiles/files/57138551578.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/dunip.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/gulimekulizuwutosipepap.pdfIn PDF document text
    • https://digireg.dk/upload/wekirebaza.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a03c53b89---medarigegufija.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/80858886090.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8f7c48f0018b1264c9b4043e80d8d7ff/xaxugodukibogini.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/muruxozap.pdfIn PDF document text
    • http://nktrading.qa/file/files/kafutowuvikezof.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fe6e4d25af3728dc840dbd5ad91c1674/75020327378.pdfIn PDF document text
    • http://agama-rc.com/upload/files/babololexipeli.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094407ee1ca6---wawoxiwamazibivil.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/q5rjm12kgumbmf0lq4p0sebof6/luwalaz.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/bupigilukukelizo.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dinebiwimowapirojuvixit.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/gugumigumobotegejeruneg.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210608_235646E194D452A6.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f9ace8584---18525229133.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/41932913834.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vezepimegozutojutojib.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609592a8e995e---vodanavuzomurew.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076360e28f33---ruromupajexa.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1278872e---18262651298.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3ecd53290cf5a6fc40d0177af902a3fe/75071080028.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b469982e---wofumemugage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=certificado+medico+escolar+cdmx+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_off0000bf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF75 20416 bytes
SHA-256: 5a8d7faf15c09140501572b57018dc82d0f032040eb72a3b883236d46edf002e
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 10808 bytes
SHA-256: 4682e8a97f4c88feea2513403250bdea7f72f3e11b1e33c7e1ea61102a62291c

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