Malicious PDF — malware analysis report

Static analysis result for SHA-256 11538cb4ad74e388…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 04:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80c539b3b0667daf9cbd7e2ce649acf9 SHA-1: cca7f06534fbbc92208feb47dc619c36678c9d7e SHA-256: 11538cb4ad74e388ca89834edfd3c6c34d9fbe24bc23b0b401d9db72f966be7b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=still+sore+3+months+after+giving+birth PDF link annotation
    • http://autoset66.ru/admin/ckfinder/userfiles/files/39339239418.pdfIn PDF document text
    • https://theurbanthinktank.com/files/fikavipupametes.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/wedodemida.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/kaferaxosozasiw.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160808c758f784---kivisepusidaroj.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d028a74637---wajopavir.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160823fa9e10d2---lapogepatojuxojadumoga.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/zidunovudalif.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160891836b1365---gegob.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/28908061039.pdfIn PDF document text
    • http://coevent.ru/upload/files/vesanixofubi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8b5995e88605aa7002bc73fa77c00a26/vameketugimaz.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/17235613878.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/sonegebop.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/kuwivowil.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/fonorafodelonefaxeze.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d275f948e5---fipuximevojavul.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160833fe920a43---40188890137.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/24948a7e0b5c54e15e241f8a3e04e841/fetubije.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/61a9342bd17aec0e6690153c3c1bbc10/2225216985.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/domaxijejuvusemebifubig.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/082700635e3fdaa17fe8e4aad6f8ae6e/77748763579.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/68643038034.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/189761897c9183809e1b3d16ca990fd4/fubogupabufadopida.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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 11112 bytes
SHA-256: b4833c38696c514feef63fc1f6b362225079d3204d4de1a7c53412e2862342ed
font_01_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 16276 bytes
SHA-256: 82213c19bc7496371bfdecc21543887b6ceda4abb25701d2eb2d0c54ea4e9aa4
font_02_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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