Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eaabdada3e9134…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 22:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcafe3e5e485a90d079f206f289977bd SHA-1: cf1b273ac5e5aa67fa8852ce2643ae03cca42699 SHA-256: a3eaabdada3e91341d1ea411b4d86ce6ba4ad43d710f7545a4e7235f879ca079
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress upload directories. These links likely serve as a link farm to redirect users to malicious or phishing sites, consistent with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=trading+forex+free+pdf PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534980b691---wodarejoj.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/bopumute.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/wixaf.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/navuw.pdfIn PDF document text
    • http://slsnn.ru/content/file/92666816718.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/ponatemikevewibabi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611fdf3c34c9c---bimigutixobuluruf.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5915e5099f---73621518453.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/punajinizigugodosulobitik.pdfIn PDF document text
    • http://lactopad.com/uploads/files/34445468771.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a133361d3---kakixenafikerofamimupa.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/43005328696.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843945eacfc---41845604428.pdfIn PDF document text
    • http://gestmase.com/media/images/file/zoparamowomagabixiruf.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/93979227254.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/180827661060fc8ecbf15c3.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/18247690032.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/39566792836.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/48367245557.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/jakuxezelama.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/jomemezalidafutat.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/60463005854.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/tiwidabikij.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/63098449138.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/26018486719.pdfIn PDF document text
    • https://asiapharma.la/files/files/57622416723.pdfIn PDF document text
    • 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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 17048 bytes
SHA-256: b8491168449259156920bc3e218f29b185503c57f94762b51b36a7b1d91ab19e
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 10428 bytes
SHA-256: f5cc689e477b5146bc63918bea0940d4ba79c374a7f35c17681990ced70a4739
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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