Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce93c32c69425878…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 11:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddd210171bb695cce0af928c0ca90d71 SHA-1: a89ce926e3aeadb4a4c1fce40ccc675cf7b11199 SHA-256: ce93c32c69425878253c07a7cf037699434dd1670d2af6bbf95029be6e9f2e0e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS upload storage. The presence of numerous URLs, including those with 'utm_term' parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://allytemp.ru/uplcv?utm_term=watch+elite+season+4 PDF link annotation
    • http://nelly-design.ru/upload/files/marepe.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/4390189240.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/687941675.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zovobijimagujipixejoba.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/gafibaziviv.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613388b1dbf52---15208771107.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/jaxulaxikukamopatan.pdfIn PDF document text
    • http://savemaxint.com/files/file/26566440397.pdfIn PDF document text
    • http://theponghop.com/upload/files/39498390627.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88199d3d1---77768541874.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/dezeko.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/lozimemudu.pdfIn PDF document text
    • http://plise.org/userfiles/file/rikomavulip.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/21395242921.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde8bdf6a3---37071393806.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/kapavajixuserakiso.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/84595626346.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/ginukajevimipesawed.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091300564981.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/lofesow.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/tetogifuxadarazixopegozi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614268c404e09---22698516112.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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 10300 bytes
SHA-256: a9ec2526185824f2d206ca8972f01f6e574cbb51f0b7132e7f06c734a3113df7
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 17872 bytes
SHA-256: f4bde04c60aba5e2d99aa1c5b1986d2df3e4133f9d3b6a2945517b4e73c12743
font_02_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1