Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a3f463c869ad42…

MALICIOUS

PDF

77.3 KB Created: 2021-06-27 21:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 38d7fe7e731e1658ed564d5c8164562a SHA-1: 11f94f65bda46be752ea5fdcc73f297ca5c2f46b SHA-256: 79a3f463c869ad423a333af260341189c4f060314e9b00f566e85d19e63d7c5a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf01fe9439---77658096303.pdf In PDF document text
    • http://apexnepaltravel.com/userfiles/file/perafiw.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/11442778827.pdfIn PDF document text
    • http://2440027.ru/upload/file/zowonufidovivusesopazem.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/48380010475.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/16799345179.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/47715039710.pdfIn PDF document text
    • https://businesslife.com/content/file/betuxarede.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ra1hgo1njekf6bj8eaqmkn033/33132314194.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b381962c92c---16764305174.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e03ef918---64962731002.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b57bd3c7f00---gusosafezalidefir.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/25023555676.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f4a005096461203fcde27aa93c74ad1e/46722086075.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/lajaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7f01d8eb---sudujafani.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1fd00cf1e5d6b959506963697e0b3c28/99467480995.pdfIn PDF document text
    • http://mamam.by/upload/File/file/7018318464.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d5819111---85978675701.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b821098c421---22436099406.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c68c551ce44e79582eceff512a3c6f/gazelutiku.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3525b289d---39510371737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=4+to+what+power+equals+64PDF 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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 10636 bytes
SHA-256: 76f4588890beb766094bf290550fa7aed3d3e7b4042a9dcbb64ece19d24f8a77
font_02_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 16480 bytes
SHA-256: ab652d7831b35cb191ed06715fa29487f8c4c380a768721dd6b57c64adca76e5

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