Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b742dcdafcdaef…

MALICIOUS

PDF

80.3 KB Created: 2021-08-19 13:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c97c42c91c209a5cb3d341ab8f2aabf5 SHA-1: 623afc3c319df8f13bee5dc86c878c75fbc5d218 SHA-256: c8b742dcdafcdaefe4c512d6c26317bf1f3fe2b3271e35dcb910091d92df0f66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which are flagged as compromised CMS uploads or disposable hosting. This structure strongly suggests a link farm designed to lead users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=how+to+change+the+bulbs+in+a+sunquest+pro+16se PDF link annotation
    • http://lyzebrno.cz/userfiles/file/marudomoja.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/wimejawapusoz.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rimesoton.pdfIn PDF document text
    • http://lblussana.it/images/file/37443137890.pdfIn PDF document text
    • http://valeneighbors.com/userimages/94331812770.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/53692108190.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/zetuvikebu.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bamodirigeze.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/d8m4a3h6lkl0qu314vig48au27/soberezo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/07d6740dd3111440e54f19be4164a639/baxadowevetiremu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/55782167177.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9168705936---fadokodizininoromuw.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/92033399009.pdfIn PDF document text
    • http://ailizia.com/userfiles/bitusuwedijojumo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/64554064160fefd6eac0d06ec9f6ba70/99541561423.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c8d77b886ce1cdd5524b288ffb60460b/72180539917.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/rebabovapozuka.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/sutagoju.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/47231940945.pdfIn PDF document text
    • http://vkts.se/userfiles/file/12704999892.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/dapenozavefakopawajajetar.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096e149a511c---65666733808.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/bidajojoro.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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 11336 bytes
SHA-256: 4193528f938cba5bae27cad66734246840962a991f50752f96ca29abb1625029
font_02_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 17092 bytes
SHA-256: f512d3fc75a47ace68cb8bc1332011a61b271fb7ed3706ac5684b8122c6ed879

Open this report in the interactive analyzer, or submit your own file for analysis.