Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2d5c88417c090a…

MALICIOUS

PDF

113.8 KB Created: 2021-08-02 05:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f634bd5f46daede7eca4fe070af4f34 SHA-1: 5a9b243b77fa39447a997a27469c43e767711b1f SHA-256: 2a2d5c88417c090a055ebd705f54e6acbf1cc1a7c5e0bbb3dae41de4aa7e0a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or further malware payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j7j4ao0u7uprtura4mnm6olls8/95717910161.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/7qaabddi3gja7ju2oq7o3ttmt1/7886270484.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1c22b723---bulipanavotovepubot.pdfIn PDF document text
    • http://waypl.pl/upload/File/15243377887.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/moperika.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kumijozapagodixonago.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/93345687706.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610558cebe2e2---45818939641.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f866ebfa5---38074309970.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/41b975595624cbe66960521ec207a9bf/64327537925.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608700262fc68---disijab.pdfIn PDF document text
    • http://cichanski.com/Upload/file/36705705827.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/25819156779.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c661fe351ec---26099497878.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/niwexozurogaxivumofujomuw.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/rifopixobaxixarewe.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/f9iv2i2bi9d7cbdlb28ak3fsg7/wivupaze.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ed8ao6drd557io9kopqk3mh5i3/71734256988.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/vazasixesit.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e66907dcb---risarinafopuw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160daa1aa33c0a---takusatogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=taller+de+lectura+y+redaccion+3+bachillerato+pdfPDF 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_off00015946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15946 17768 bytes
SHA-256: c2d65e7457b8143b09bd7d0a86bb9cb3dd9a29a10794beb724f28ac0ca3fa177
font_01_sfnt_off000185fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185FD 11040 bytes
SHA-256: e98e211f025746704740cce15b04bdd8d7cdf5e2642975162fb97df67f9a0b6a
font_02_sfnt_off00019f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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