Malicious PDF — malware analysis report

Static analysis result for SHA-256 d391ec73baa170c2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 19:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad2f516c8cbe83f0e8686105e8369972 SHA-1: 006094559cadb501b1b7034a76ffc3824744c62f SHA-256: d391ec73baa170c2cde3f5dbb0c6216e1ada4bdadd6a6b5bd8f835bef46f25bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://actor-conseil.com/files/file/jawafudesenowejojitu.pdf In PDF document text
    • http://smartpaintingplus.com/userfiles/files/watiruripomug.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3f6fe0f6a7ef8bd22d5b60357dde7c76/gosimudimuzasogaginirik.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/niwojarajulopanakewuraki.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/67144386124.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/tuwuwikexokun.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1d9c80293e55d86d9a234c45e01407c0/34405193888.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/pefadomijumifebu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///ledisosapeze.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/sexaluwugupivoduwix.pdfIn PDF document text
    • http://alkanboya.com/files/file///59299727200.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9i9fl96uf7dfuue7gpkubmcl2j/kulalokakuviponovun.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/15211719627.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202171142029994.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/fisuwalevobibagolefozo.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/77795608460.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/26819752773.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/saxusipad.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/kaforasudov.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/vaxirusazulopilofodu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/tegewevijida.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e338d33e7d5---47288598572.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/962f06dea82fae8c953a33cdde9ed8c8/xojakejamavumabobukebin.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cc16b3a3---zidofimafa.pdfIn PDF document text
    • http://rococosofa.com/files/files/busekosejikewodirefateke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=john+keats+odes+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_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 18356 bytes
SHA-256: b9e6ff597303d23eca2fbf9e2f6b405d167ea828fd18ffabf550263edcb483c2
font_01_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 10440 bytes
SHA-256: d651e36be4c98961f6116cf6f1a18106567c2804aff7c3937b183fa860ce2eb6
font_02_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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