Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f2d266e7ccebb4…

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 05:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ad78645387c3ad9c1aeea00981a0da0c SHA-1: 5601c07a50b11d9602284eabe7e22e06e01d8262 SHA-256: 53f2d266e7ccebb4eda909d54b03a3fe0c0efe13abe9eeeabae4ef90d4848634
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on potentially compromised websites. The presence of 'utm_term' parameters suggests an attempt to track user engagement or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8fa54a7a970adff39fde33eb7a0e59de/614969443.pdf In PDF document text
    • https://glbtrader.com/userfiles/file/96380141978.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbb479465---pigipirilifewefu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kosowodovop.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c52cf1e29181e0a449d1e463b38df467/ranolepuwufisawijotetolu.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/27320614228.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vguh38kaaccodqhqmggklrp4lh/benepexagamotazilibodi.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/kotikosewabipagabe.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/emmvir20qaqhpkddf8i1ulo85e/53390490193.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/43183292692.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099c95134981---zogaguditanikogupaloji.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c31660a5b61---10489788141.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/pesudexewisowi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/inmlaqd204qr59gq79h1pbadp3/71801881423.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j288r2dh3ug9qe2ft3o6u3d3f2/92902456761.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/detidetixosesepozuv.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897e1759d14---sewenifovegivelokalozajip.pdfIn PDF document text
    • http://soupworld.de/upload/file/59249746759.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/704815cc7525ff3a9014015a2c2ce645/dejevetafulinepamixin.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/63875743913.pdfIn PDF document text
    • http://ridendo.cz/files/file/23128423849.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082596c1da8c---28067472143.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/warepamonidupopofuwolob.pdfIn PDF document text
    • http://sakem.org/userfiles/files/55558495887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=powerful+prayers+for+miraclesPDF 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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10740 bytes
SHA-256: 5657c959613bb06e48a4acb13a62056e6852a5f422f0dfae7b2e72d0c2d143af
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 16292 bytes
SHA-256: f8e9e316c3228ce6c02639ebe25b3c535dd06ebd8776a5879db4177f473cbcd6