Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cef30a35526f59…

MALICIOUS

PDF

94.3 KB Created: 2021-07-02 10:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7d2c3d002e9c85abc1032485a060906 SHA-1: 84fe227fc3b2c7ca76d92e67455d241dfd0cc334 SHA-256: d1cef30a35526f59a947e1ceb1d984f46f46fb4e90ade68c6efc67a79219bb01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5683db3ba7---27125855878.pdf In PDF document text
    • http://infunplastic.com/d/files/pubisuririxitagepato.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/lewalexenazim.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/79285574582.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/48374824484.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/vitonuxubifawajuma.pdfIn PDF document text
    • https://naoshima-habitant.com/20556155560.pdfIn PDF document text
    • https://hirurgija.me//files/16344367553.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522031049853977919.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/kiwutuvasekofutagiw.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc299c1803---80344046660.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/30474306554.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96822232059.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/galuv.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee1126e50---dodomuku.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6c1faaf38---57495888289.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/mepajovukumizonegalij.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/3455781504.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/mijeferasusufisidetabu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160abf836e4e26---14067055438.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bee50d0d7e26be51e5de8ccf238830e6/97876079740.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc54f2e8f---kewozabozaneso.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd66e07bc---zewegifikegorozisediv.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/449de54a4a3ede2eeb9f09d68120f92b/gokazexexuvibejo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5d7636fda5031e61c13d031c699864e/48724285938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=b12+food+sourcesPDF 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_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 10292 bytes
SHA-256: c85e7333409bc08e26615927c0e24b3a22accf0980417ee6f5015cafa80b9934
font_01_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C74 18004 bytes
SHA-256: dc0f111242ad7093634d81ca6e05e9888dd884e2f303462a513d3a14d794a634

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