Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5fe85e11b507fd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 21:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88a4efaf2cca85bbecd87583d7597281 SHA-1: 72265564c7275ce34f0fd2c06f24c7938f943b2c SHA-256: 8d5fe85e11b507fd55df1ca65eb98b84dbeef47cab92fd88a58c428c8e9a59cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7160082a3---jasevisebesopebuwogokuxu.pdf In PDF document text
    • https://burgaseguros.com/userfiles/file/6048867945.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/83e9df41629d89f540db2c52dc8be311/99987215425.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/zemozozafa.pdfIn PDF document text
    • http://fabtur.ru/upload/files/gixefavanunifor.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/42c9c4f93631877dc554ff368da9a376/3965730436.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/vevagudofun.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/63375957821.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210827203455226396pr22md.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/1907981432.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/vozixitimofamu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7d6379ca---vuxojufevimotejaz.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5af871d6---mimosaneweruda.pdfIn PDF document text
    • https://soechi.com/userfiles/file/91207603043.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/venevabefamozojuzesi.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/mifunezobexaxomoputo.pdfIn PDF document text
    • https://bem-sa.com/img/file/pusujedepesurozone.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9df180c4f85a21e51b9abdc3e2aa154/29037600358.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f112b3e17---dibolaxurixanokekib.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/nemovamon.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/supajitoxuzidakatore.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/85349492735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=branches+of+biology+and+their+definitionsPDF 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_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 11060 bytes
SHA-256: ffc09ff34dcad5498dedda82bad0a267fef7ec0593a586df66e58ffea2194a90
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16528 bytes
SHA-256: 9e8657cde36e2080bce5aa49bf65aa72f5d23d722172fbc834fcc5e459bf7125
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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