Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2a2f7b5e257fb2…

MALICIOUS

PDF

81.5 KB Created: 2021-10-09 21:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab5e61ca13e472301587a40f1e215fee SHA-1: 42e0d7b079cc386320c194506645c74c06785256 SHA-256: da2a2f7b5e257fb20206b1a7b67e24d60c6828f885ada1120c03f36ebbd59de7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://manhchenang.vn/webroot/img/files/47103701226.pdf In PDF document text
    • http://peterpan1996.it/userfiles/files/bozupatafumebutoku.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/edf2430f4b47eaee7410ee62e2750a16/vudukufowesure.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/vategoputumiwokepa.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d601d7d164---97818032497.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/46142740912.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/pajepubiluliw.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/21683380699.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/badadij.pdfIn PDF document text
    • http://greenlandpark.com/uploads/files/54447412634.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zasuso.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/63691365618.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/72308215243.pdfIn PDF document text
    • http://soc-in.com/data/media/files/kovabo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/19668654507.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_06A04D55F7B37768.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8s9cvsvcjq1vgke9kpaaha428t/mifejonumi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/54971013834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=love+life+and+all+that+jazz+pdfPDF 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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 18136 bytes
SHA-256: bf38b8a232dd72fd8893b6886e8367f55d4dd02b3320e8e495e04e0173f2647d
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10540 bytes
SHA-256: 2990f08aef380447a60b372c6d078591c8fc4545e66a32ff2eae3024128114ac

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