Malicious PDF — malware analysis report

Static analysis result for SHA-256 192ddd7655495900…

MALICIOUS

PDF

91.7 KB Created: 2021-07-21 17:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a99c378d59d9ce13380c7ed7a62afdb7 SHA-1: fbf62390882362b495a1c025d1a9872ce38aca26 SHA-256: 192ddd765549590090043de2b1c20aef2c092924738803d989bc9b18ea03fec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely intent to deliver a malicious payload or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465692b31e---xupiwupejapojodotuboton.pdf In PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/40731706093.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0bf0cd36f63b24210ff79e94e1bee51f/punozupufaseboj.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/625c72a5bf0edc8dfcdf401b34c2d533/6521397868.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/89078333441.pdfIn PDF document text
    • https://superpart.com/files/64181253577.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/331d1d8098245b995a1abadfeb6f3226/99528800565.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2c1195f0c6d1dbdf18ca156156fefdb8/96304418017.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/58b38c5926d2d3fec2894eb24a726859/fadij.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/saboveparavi.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/96472076424.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/dirofewajom.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d76f06709---wesukegejegaka.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kojurokevulerem.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08c0f03f8---zepaxutopanomo.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lh0hdfha4dkmlvhgp8doo912k1/61467198771.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794149b63df---zuvusufuxejoxabotoxorejiv.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/17437474965.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nutanavigububig.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c03eb1194---zidorezemefapikumuwovuva.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d95c69912---70476330264.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ukago82ibpsl4osefio5sessc0/46202528019.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/81996157104.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/nefojovipesebapuditenoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=unique+baby+names+starting+with+nPDF 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_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 17504 bytes
SHA-256: b7cc046303803afb7b7fc5161d24080a43f9a2a2fb7cc697fa01919218e3d6a8
font_02_sfnt_off0001480a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480A 10984 bytes
SHA-256: 10ef75ac27d2d2ecfe8a45de17f0641cb66bd039bdd42ea6292cd93667524690

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