Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce61f37be53cf892…

MALICIOUS

PDF

72.8 KB Created: 2021-06-25 14:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3742d4c24711f51a8c77bb7e752325b2 SHA-1: 9a88feea1712e209fd71e069efea105e67181589 SHA-256: ce61f37be53cf8928dbf4304ad9a8d40d88210c57bd62a5af433caf54cc0d042
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/uplcv?utm_term=the+best+way+to+learn+is+by+doing
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9045046ff---54687702691.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160760377e2795---mivivemosugu.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/16e6v7j9vp1j53bufqpu3dl5mj/36700364515.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072541d5fffa---kitoranegepogotesij.pdf
    • http://accessiblevehicleservices.com/userfiles/file/voziwuzubedubirelupix.pdf
    • http://goodtraefarm.com/ckupload/files/44552714691.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tp36r6lbogf6kc2p0rhtb797sf/12859067670.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084379396da7---subimovegubela.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc326108d---47368926333.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4399cd39c5---dutexok.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mv9t8qq6lg1uj9ibsvl1alnqo0/77110507388.pdf
    • http://ahcxdq.com/uploads/file/151236103974.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/27541239493.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aa775f4d---35524403518.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c31179a66---54985930696.pdf
    • https://asthasupermarket.com/userfiles/file/sinena.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6a8627f1---77896496500.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_off0000bd7f.bin
4facf8785431cefddabfee9cc318d0d6bdd03be7e7fb2349a58550bdcb86248c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 10832 bytes
font_01_sfnt_off0000d64c.bin
0d9dc3bcd7fb00997f4ed1b78f23b5fcdb8e1000e184fa81682d74f07f7e2da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 15596 bytes
font_02_sfnt_off0000fe1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 16792 bytes

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