Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20bd2eb93adc455…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 04:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1e26dc28834a058f67e871a86c43722 SHA-1: fb304915ed8edd0b5613d399e16cfe2acadc4e30 SHA-256: d20bd2eb93adc4552a9aeafce409eceefd01a271eea8d1cc7a31d635be41c7cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware or conduct phishing. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gpszone.hu/upload/userfiles/file/45405371925.pdf In PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/28282095827.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/juguwanujubiradudososow.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/43129060489.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/lerizu.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/jutanixuxepufijewulu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2llahqck2q72n8pupekbk4t6re/61586831037.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ba09bec0---11741583529.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/62011512710.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/99373672266.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/voteviluvamox.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/64237277093.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f8935c4b715---giwagojiremolamad.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2297a2d4c---35131566624.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5f9ccdbb8764045a9984164b78ba4c4b/lojasisoruwok.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/86109644555.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/kifewiwod.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/32747765653.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182f06597e3---waragevanugitosa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc98979bc74---62004240565.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/12595161405.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/34483062900.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/xitixiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+grinch+hate+hate+hate+quotePDF 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 18296 bytes
SHA-256: 05e330bb4bddcf4ced82f77f3a7fed45939415b9c25b3c313ea99f31aeef9c5b
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 10504 bytes
SHA-256: 3e9842a5f12885ff046c2a371b7333a9445cad4c77e736bbfd86825f7b0b53ea

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