Malicious PDF — malware analysis report

Static analysis result for SHA-256 95de6fd473eeeed8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 02:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84a5a536357971f5804138d01c980561 SHA-1: 58c75259eb07725668c4b6efc68a8892d68f9941 SHA-256: 95de6fd473eeeed8cfc2abe3eb580fc18bf58ee06a3dfbbd6a6c8baaa445e3aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=altice+one+installation+manual PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7a2759562073e886fd7f59df79943f2a/37527510541.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161014ad49820d---sesixojurako.pdfIn PDF document text
    • https://ivanamihic.com//files/kiwijabe.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/labikono.pdfIn PDF document text
    • http://texmet.pl/userimages/file/7815037407.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/28354024160.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607070a23ec0c---gasomarilofisekusiva.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5704jpe84iimht3r92ik81gmde/2488656056.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a9c6c65b---dokukipik.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/kakeriritaworefasoxasefe.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/nugoxepusaronideva.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/96528725387.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m909ls4qurmgvoqd97m9lr93m0/mewadelelopibe.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vqupsvqa4ln5rgiqffvqu5s4t5/7882400964.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/fiwobokujoxu.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/sowotov.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/jisasepugokemi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cddfe7e23---bakujomunixekamixo.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/fobozus.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/nugetijejifiwifewebipefa.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/vamanozon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 18212 bytes
SHA-256: 7a67fabe430be29e37fbef4dc67880fe92fc346cbb05a948ee449ef9a0b4694e
font_02_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 10372 bytes
SHA-256: f4347b97faab7e5c33bf34f765dab6de8c834ed97cc62e654cce1aa77f44d103

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