Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab395baf085ec958…

MALICIOUS

PDF

74.7 KB Created: 2021-07-03 22:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6df4ad307da5b0050b0500f76f7b1b6d SHA-1: 6982d94ebc432f49dcb16e648ddd4f0b0904391f SHA-256: ab395baf085ec9587ec55964795e273e5193d9158b25176da22fb5fd00cc0a53
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm indicators strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e649a7d7f---modawojativo.pdf In PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/27459087385.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dd98e213---85387245039.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/25330580564.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bhbtptlq007m2rg6j5jfijv0f6/22532214908.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae3c76478---66432932095.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/69669978906.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6b194640---tujid.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25938bed8---77104477540.pdfIn PDF document text
    • https://lecapsuledigian.it/file/35979576135.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aacc1d285---50571124321.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/patifafakaje.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/matufu.pdfIn PDF document text
    • http://metallpress.ru/files/88635183490.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97af635c2c---17894873509.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/rodewajafosokowuziwivopid.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fad0d48f7---92195964642.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091055672dc7---vetapovisofarin.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b7e0d8d6---kobodevatoto.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/13a7526ae68a39794173261413af0b8e/98202861752.pdfIn PDF document text
    • http://proxima-design.cz/files/file/lobobumoled.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tibikexuguramezad.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c567d85598f---jupama.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/lalowerak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=grade+7+comprehension+questions+and+answersPDF 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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 11156 bytes
SHA-256: 241c3b7ab5f8648862fc5e961b36af7adffd0d99d9630ff88ce2fb6932599594
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16240 bytes
SHA-256: 1b819e90e2c4da765fa24f5848fd53f122e5ceae112ff1dd81d74352c1c41395
font_02_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1