Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a95f28a46eb220f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 13:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ea9d56c09a5781fdf2c746661871019 SHA-1: 82ebc28509a6a07b997ed8b4ab6c4bbad952047d SHA-256: 2a95f28a46eb220fedffd25bea3b7da57f4d7141aac8d66facdcbe49db5f9cd6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbc8f3b64---japusapopitinisajapul.pdf In PDF document text
    • https://rajatotogroup1.com/contents/files/giwuzivubibujon.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/riwor.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xelubumede.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/vumufidi.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/jutida.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cbf26ff0---zufibuvoluw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fju5p0nvm0dn9du4b1amrhq3c0/lerosefil.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/69629923704.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/bexegisemuranekogoni.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/75048902985.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/kuwelinawewukekoje.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f1625c9932d3857ba78235bb04375b1f/zevifozikor.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/76009180513.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/6384723556.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/80731848732.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b292tk5b28o506o3j3ch2j9e34/jejubib.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/71853651834.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/bagolagemesofipajarilas.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/bonotat.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/54527243022.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/mijetukugogituku.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/91665537971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=eerskraft+crafting+pro+building+gamesPDF 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_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 11276 bytes
SHA-256: 6a9d8bdb023e8965be5e9faf186957adf4a46824812fdef88add38c8551c2998
font_02_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 18168 bytes
SHA-256: e670cc670f34cce2dd00e52a8d3dc9547f1dec7a9305d1fede6673ec4c20e8f7

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