Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d25cb40af61cd7…

MALICIOUS

PDF

131.3 KB Created: 2021-07-08 13:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4ede05fcf98641390ef4aa9e2aaa8ec SHA-1: 14198034295d934cf08a2a554f5c13680c4f5922 SHA-256: 71d25cb40af61cd759f1a3777476247eb8b20e69cd10df41d9807e900d94cb3a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to lure users to phishing sites or download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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://chcial.ru/uplcv?utm_term=the+buddha+in+daily+life+pdf+download PDF link annotation
    • http://vinhthuan.asia/upload/files/fanaxedopu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/kewevesopumisojifipadu.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/87097385776.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/86dae7547931b8c4d1b4b0d91eceb33b/dibenebutawaloratiwiwafub.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d277ab415a1---joribazabunirawes.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pisimasuginudujisu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f220b7200---fibomivumekakogodiropodeb.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbbda740b9---feveliso.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/63dd8d001d6cd61f451b4f6408eb591c/sanazas.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/16367356882.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/80a4e48d1767754b450bcf552d6bfa55/15563213273.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/25528401453.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kglhprmpcdu2uhqjkd0jcgrec2/41895790315.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/62192221913.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/kawojiri.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b539aed23---sawikigepawufu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae330c57d---81921935121.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/guloxinikejufaloviwis.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/52122761550.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/4224776ec3572571c98492bb4179b125/puxubuguv.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/43899177747.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455b7b0808---16118989124.pdfIn PDF document text
    • http://abc-tel.ru/data/File/7511252209.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e055d3e2c7---60816782784.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9424db0acaa8a0744528ae507980c8b4/11476558315.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609554e2317c1---turekewudoxowovaruxu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19698 10632 bytes
SHA-256: 2aebc2982d97999c305b47dfb33599dbf2ad48c07f521ce035cb61eec0ef330d
font_01_sfnt_off0001ae95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE95 2128 bytes
SHA-256: c64c6b61c6df10ad0b8ec34926d9694063af0bd37a8fdaa565e430caea30c6d7
font_02_sfnt_off0001b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B829 18100 bytes
SHA-256: 36142a09252cdbd8d5e266b041a503dc7a6f758276dbbcc0445db36703909ed7
font_03_sfnt_off0001e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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