Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b38874a3ed198c…

MALICIOUS

PDF

67.9 KB Created: 2021-06-17 10:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8fbd24a35489fa10436a92dd2d8212f9 SHA-1: dd0c4574ecf147a9233abbc8fb5079cdb0a4099b SHA-256: 51b38874a3ed198c24142694922aeb0761d91c9cae378a010ae56e563a19bce7
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests the document is designed to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8879

Heuristics 4

  • 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
  • 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://pistant.ru/uplcv?utm_term=cutest+australian+shepherd+puppy PDF link annotation
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/p0fvt9bjtdrutl5467okut3ti6/22695217052.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/fou4810ro0fb0ndfqn68n21v68/76561794456.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ef97bc712---6781163529.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93a675399---xikipirutetexurulonofok.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p11bu8o9otjumg0igdgu685e72/wawegapav.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f06a79713cf19972b61cb5f0077fce28/mimemalenijizabipinupat.pdfIn PDF document text
    • http://actor-conseil.com/files/file/zomin.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/72370892666.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d2e572aa2923172f3a50ebe124cbb432/66702633286.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5c628890---20154800825.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609989d759848---garaxelaborosemifenata.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/27379228155.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3a9609d13bbb93087dbd3a0c12b751cc/zoned.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb820c6927---nakewedaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 5052 bytes
SHA-256: a4eab5bde52d8ab7dc76117e95a8a2a292608334e35e41dbc9ef41d19b3882f0

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