Malicious PDF — malware analysis report

Static analysis result for SHA-256 343dfaec5514f799…

MALICIOUS

PDF

74.0 KB Created: 2021-05-25 11:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d33e4855c13ee27d94440a947b0edd77 SHA-1: 9bd5585c473fc9a0ef60eab5e78098a1085ccc21 SHA-256: 343dfaec5514f799845a244b0ebec4752a41d87da5ea256e010f7eca181785ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9291

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3bc4096c---38493608250.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a878cb3a---88195724019.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b1e38dc69d322f7665ad0ac1f5c298fd/vemupapata.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e7e1948e492fcb2612355cc1388a2267/nazepesuzed.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/30879724888.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a6a4c42d---wojuzaku.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/10670311b1c0b1c02bf665d6ddd081f8/jigijuwinexepuzozetofez.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/297007c5eeac04ba4e37321a6556a145/4019801504.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085813cce050---95381427721.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d033233b2f---sisajogo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f4173f9de---96632309092.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3d4838cf1c93a3b41146736e6198934/jedofometosot.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/i462pqhvckmfck34ri89rmh7v7/dulanilupafojid.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/gujetawu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0e8498585428081af8af2a0e1b04e898/18136540943.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc78fcc75e---82789102107.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd1d3e1f6---10120238585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=guia+del+ipn+2021+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn 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_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 5120 bytes
SHA-256: 9a384de1ece8dc28b76b61696708a6d3feb007e3c6bce44feca096e02818e007
font_01_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 11312 bytes
SHA-256: 7c2a1f716f28cf1b54d08698b6cedcf1904a1b0327ae66d1be2bd0ab6a6effed
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b