Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82ba22905e0fd75…

MALICIOUS

PDF

85.5 KB Created: 2021-08-12 09:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87530071662347ac49b1d3b29824a9b5 SHA-1: 20cd5c9c21b6fcef89e5cc50f126388c3232265a SHA-256: a82ba22905e0fd757a53e9984dad65ec3ec63c7681ad81d998342949a7e18e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://genegurumiraclehealer.com/userfiles/file/11215950638.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/tejotamajunisu.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/semopemijafamesidojixebe.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qc5l07oifq15ffenmkevriok4d/rosib.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/06c7733e238da4e57bdd1e3d5bffb121/newokesanugebeve.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/birirulorema.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/luwozisibavulizodujikozut.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/nopazigipuf.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/27764133371.pdfIn PDF document text
    • https://wittnebel.dk/file/redabakobutakamaruwijazi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/dc4f47251131300c58b0cd103606a423/88632253838.pdfIn PDF document text
    • http://medica-brno.com/files/79798773688.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/wodedojadove.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050502121656.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/76015667375.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbddfdc1b7---gedafonejiji.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/80779307325.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/vuwusoxepes.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/7213148333.pdfIn PDF document text
    • http://armanetti.com/images/xured.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/dazupomulitaroledagumama.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/28672022444.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/76608821731.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/tabibubefoxinuguwulo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/47dflnvjtlso842bgu58fvjpr2/80392100324.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1528f9577a---solotimafutevedojamede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=designation+letter+format+in+wordPDF 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_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 17200 bytes
SHA-256: dc5c3f5a6f481fcfef0241c1b7fe931ce2e837dc602b04ef561c4dacff5457c5
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 10784 bytes
SHA-256: 613665f08534ef364804e77bab45315be6e3e74ed1ce69551915c693e1b20ec4
font_02_sfnt_off0001304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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