Malicious PDF — malware analysis report

Static analysis result for SHA-256 e517aeddd3ea4c71…

MALICIOUS

PDF

135.9 KB Created: 2021-05-22 01:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8d7749a57354dc41d47cfc4182de160d SHA-1: 39ad70b13e21e78060df0fc813ece907f257ccd5 SHA-256: e517aeddd3ea4c71419cbbd94aa8ee8141a8991c3e38e8564f7785dfbe121684
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce11f48a5a---42757649035.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1dc3tg6edksv452a27o5gfebt1/33563860419.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f191ce64bb---bexuzagorunupen.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f3d7ac7eeb672dfdb04c02349cfdfc73/68569952907.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0aa1f790e81a9a411f4cdac259b1a8aa/siweje.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1907b9abe---mezogunimomuwugi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4e0d9b8a---wilasujigejozuronub.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/6f3ee47bd85554ee84056419023ece98/4096762900.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e955e4af9---13532274766.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zefolakeponu.pdfIn PDF document text
    • https://bloomeng.com/uploads/12255713547.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/11458d3fff3b4dee1c94c52945f6bd72/37705939986.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4365ffc7a97b50cc216114eba322bd36/38979270823.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609273ff24a5b---puxituwuludab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=examples+of+parallelism+in+to+kill+a+mockingbird+chapter+13PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6D9 6016 bytes
SHA-256: d8e1aef0d5484ea009ad308891d0188a78604c0659e5448d5972a107d92cdb20
font_01_sfnt_off0001eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB31 11648 bytes
SHA-256: 93c8d5ae18ba41f9b0cc9caa7c4ef1f89f5aa1cc2b5d65c5dfaf1f3d42285218