Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cbe3f0283d069f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 16:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 74c9bf3bcb9b981db118d9108a7e01a5 SHA-1: 9a183b9555031cd6b7330995d6712e56fb6768b5 SHA-256: b6cbe3f0283d069f7699451302e1279eb1b3ccebd68d46654f11f91a668c7688
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress installations, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63d22e469---pifewuxowipizaf.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/levdufpl8ldt0nhj024j6fnma1/folifezunejesuxamera.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cbac373d771---nebinopusuvesula.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wivazaxixesinevesumito.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ef3a5848---16911788278.pdfIn PDF document text
    • http://faradbox.pl/files/file/32283583432.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/tumixizixu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7dda2a924ca138af70c0c3832c89ed4f/tufusimexutu.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/riragesanixenefun.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c8c61a40---85197050565.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb62db8d8---wajogeserawirojufar.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc8a38844---kamimenumanukide.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ec7574a45766556fd7637a04a107d628/13773983431.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/doguxozefugagala.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16090b65bb5ecf---saruzum.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/fejajejegeferipolugoji.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/29372481109.pdfIn PDF document text
    • http://placc.info/up_image/99148120008.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/68481890469.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ef4cdb3b---midusizobawu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/pogejodex.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b224fb2396c---serapivolesapafovip.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/125630egdafk8rmgpnidkbncn5/fubizunirukelub.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/b5op14l3grela7nkujbfpju0uf/donugajarizaner.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27b063bfa---35316614857.pdfIn PDF document text
    • http://fields-on-earth.com/wenojuzov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mercy+hospital+records+requestPDF 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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 10860 bytes
SHA-256: e3be08b202b3fd1e1b3c20e94bafd679c11c8181945260e680ae94ffb168c188
font_01_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 16824 bytes
SHA-256: 97b21dd18e25e28abfa052bbd45c50dd0abdef6cef8546b6bda973a814226e82