Malicious PDF — malware analysis report

Static analysis result for SHA-256 98964e662a88e66b…

MALICIOUS

PDF

113.3 KB Created: 2021-09-07 03:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7e6ddbbb7c8ebd38287186db85a0558 SHA-1: aef068b2dd5dcb70d06e2b95e550b0be6c399acf SHA-256: 98964e662a88e66bef5a76248d0b64830e6095dac271a92b5df97e8449c4c3dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161335904c8ad7---54827935440.pdf In PDF document text
    • http://minicabii.com/survey/userfiles/files/75804683652.pdfIn PDF document text
    • http://poiskvod.ru/images/file/77653423049.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bb9c1571---posakofirusadogedomijo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8ae324fed88c0b93d700526512a8d1e2/xogudezerubajedusitixiso.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zawuzurusijapufowizidat.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e62d89d0---losigatot.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/loxosaz.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/zujebapez.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/30314271344.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/49996998843.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076582ac1f33---86446137666.pdfIn PDF document text
    • https://agros.net/uploads/file/lozowuwevujutevepuvoji.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/74670109023.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b7fadcd205b39c1e13415aedeaa19903/mefezovekedeli.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210906101245_dmVmZXR1bm9m.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e950589664---36257520241.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202108190400101809.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/61962670645.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210804133009.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/bumubigegijuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=victoria+and+albert+museum+map+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_off0001518c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518C 20028 bytes
SHA-256: 5f24c37e7c23a9c93c8448f687a79653f7001f467ea1295cb578cea2e9f69356
font_01_sfnt_off00018632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18632 10988 bytes
SHA-256: d9e368a1668725560c863012573392d29296d374b6cdd1168657cc2d03b251c7
font_02_sfnt_off00019f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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