Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84e0ea2d5f1334b…

MALICIOUS

PDF

92.4 KB Created: 2021-07-20 03:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a933004d71b0326f26de1c0abae5e94 SHA-1: 62c208121224f8bff288a64ba500cdae0027deb3 SHA-256: b84e0ea2d5f1334bdd959059117facec5e681d3cbf12dc3af95854c10f2d228f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jjinline.org/file_upload/file/zofiw.pdf In PDF document text
    • http://vetcarefoundation.org/userfiles/file/80005638546.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gekerepogurubugebad.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/57018618522.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/worawo.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/890610f9b8c5123c6e52a96db660a3e0/duwabiloropisaj.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/dmh376l3hh30vgvtib66i9mpla/91217527994.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/62839549532.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a5899167---45471352971.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6122aeab381ad8fac5e33a418aa554a4/kupisidopilozo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db3558fef---pukaludafodozebevukifo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f5d6bdfa---xojonenaledatafo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8ae014525c38315da966ad3c89144977/28627779974.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/labexalokuru.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/42975473298.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/rezimowiwedokirizoza.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/05e1ede89aa6430df6c883558d80edf6/90885710937.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/juzederapu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/63758902369.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a543d5d6f9f---52045605207.pdfIn PDF document text
    • http://kasargod.net/uploads/file/98471142942.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kugoxagazasofalojezaxud.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4bfb631e8b4f4420880a4a586a3aa1d6/6036232788.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/33323888037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=state+tax+identification+numberPDF 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_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10840 bytes
SHA-256: d5abfefbb71ba2696e7d4430a69951c8d811a1b0a18265197f9acdcc23da02d0
font_01_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 17188 bytes
SHA-256: 965fd859950d06aae7b14efc5269f4b394333932fd4bc75c4b8529edb6c908ee
font_02_sfnt_off00014c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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