Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04936d5c8cea2dc…

MALICIOUS

PDF

152.6 KB Created: 2021-06-26 15:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f8a3ae6c31f38251600816b00ffdacd SHA-1: 8d6f42e81135d4ce20449ac9937fdea0e7912fe3 SHA-256: c04936d5c8cea2dc09311d56f5148ef76da5c915055accb6c5d828ec404d49c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9354

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/320e60mb08rvrg1jd5aleid1n0/31741250299.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/752cee5c761e870e3986b79b2312c31e/fenoripefolexafope.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d4e42c40ebd88bfe66d802b1ec103422/medufoxujifojosufisedug.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/78v760b68ojos43kjccca453c8/90498168563.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/37914961552.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/gru6vib0lpqgvek94ke0hffppu/dujag.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878454d260f---50859966793.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/nujiz.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sukikokupef.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7f59fb89f5e970a9e4f0846157035b65/xegilud.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2742510d5321fd2fc1b1afac5120cbc6/karazizafeviz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/on579b4c1tj0rv7smh6lgmda7n/silajotakupojuluvavobarel.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/rigolamabu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6f2f15b0797a543730ac6f155ed8f592/xikidojazuje.pdfIn PDF document text
    • http://iphysiology.ru/upload/30717609618.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2555f730295edb993483161256cff337/gefamolufonej.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/03168bc6da4aa5d6b14bedd7a79d943a/tenegutuvapu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609569d8cb4eb---pikexola.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/gegat.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6ulselapcnfn23pnjtjmhb6ir1/5330471169.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3557e3bb7f---6009072667.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbfa9ea0d---koromafar.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vgqmj6fpfuvoast5mqhbtl8v4j/31470665509.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/35938840695.pdfIn PDF document text
    • http://becucci.it/userfiles/files/namomigenezor.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ma4m7kar5em4gcvuqsgbo655kl/62537002862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=have+it+any+other+wayPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 117280 bytes
SHA-256: 00afe333c8e10991e71b15955eda7416f7ad69ed3f6c8a984bf50156d9d6f4ed
font_01_sfnt_off0001fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA8A 16940 bytes
SHA-256: 8eeebf1956de07a190860d43efe76a27678f739890250d9b0fa54d3448660f1a
font_02_sfnt_off000225b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00023dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DCF 10248 bytes
SHA-256: 33b88d8a8c457215c5a124983fa6bb35f1c7c63b8c02c39c043a2b3d2cc02131

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