Malicious PDF — malware analysis report

Static analysis result for SHA-256 e498df416890debb…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 12:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b002c5abcbefa592ec65c6537b1de509 SHA-1: 9cf2621bdc6be9af30ae545e169289df1ea42d78 SHA-256: e498df416890debbe79b17796e8231f0f86b273983902115f277e4115bf112ca
156 Risk Score

Malware Insights

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

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 multiple URLs pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/04a3ab05c95d59bc8d8fc2a9a9bd4352/40178399832.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e018c669---zelotasasarotigiwinow.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/dfa4c8a7b9c9bc5007ad320d8e901400/gosama.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/81918704214.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e2e32efd7da3bfe00bdf59b3e8cd3e6b/39329207627.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77aa11c749---58745986059.pdf
    • https://iwnta.com/userfiles/file/vazuxip.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/os5ivkep8hmqkjvbj7l28unp9v/37008994668.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b201aa2d---visarakevikitotakunosub.pdf
    • http://campcolefamilyreunion.com/clients/82065/File/50567299860.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbae02d54---pemunegugoxupa.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17da6c73f3dd1e07ff08735911ca2371/28585457903.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c704bf043---zutipiniwojeta.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c466a523ae116eb0dfb1f980400d167f/88981628571.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078dae8bf094---dadaso.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160759a36daa11---47897490415.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=little+story+in+english+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 16792 bytes
font_01_sfnt_off0000fbe7.bin
1fccf2c820778e2ec6de997617a7491f1ceea904d724da652240b26ef2db6ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 10684 bytes
font_02_sfnt_off00011419.bin
329d38d046ac47e9058fb28b85d24c650748131fbf9b9b346ab60d29e5572386
pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 17148 bytes