Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe36aa7f99e9cd3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 21:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c43e0d242e372f7d30d27c6f76031b8 SHA-1: 67e71105de992840e2e033a3d335f009537ba83a SHA-256: 7fe36aa7f99e9cd363ab421592fe6c00b27a15b9cfc73e54413546ecab0b0014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b462aef5bd---vazuwawakifebi.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/46158973737.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/rejexubin.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/fotevetijifadibufu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/gomedaruripidoto.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c239aabaa---pabigetopusoxeduzikanaza.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/bb14abc299ca51d738258e320628481b/75575473407.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc343ad472---wajonosaxuvudokosidomagu.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/guxonukidusuditawu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8a3e2caba3d93519b801189965cba118/87833833919.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1fe36ba1d5500ccabe69c55dfbb42972/72972526726.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080191483d89---jumozixitabol.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/xarotatijukamegubemub.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4aa4b0ab---giveputigu.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fb11527535a669bd0d7489e6c7bdc53b/62814029017.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0cj6aq3n581j49u5ts62pf0nea/6073542042.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6d6c01b4c3c9d57a1a00b24fc68c8cfc/68762594234.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/gepugifak.pdfIn PDF document text
    • http://ttc-investco.com/img/files/58938180125.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/186d6c1d5435f8b387937f7d87b2964d/45492741285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=escepticismo+filos%C3%B3fico+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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 10536 bytes
SHA-256: ea46e0ade40618fd5108867064bba603077e3f59451d19167aae568a1fa4a6f5
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 18956 bytes
SHA-256: a0f0fb711351ab766df52016e955f408ee12ab1219e1c1d2f1ae570b01e5a0e6
font_02_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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