Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdbfcafe582bd92…

MALICIOUS

PDF

84.0 KB Created: 2021-07-08 14:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d952987fc9861f0ba995149d2578580b SHA-1: cf89f672a0aa6c6db7a2da46dbf02023221b5fd2 SHA-256: bbdbfcafe582bd92e77abebf744aaa7cc93c415f3915b22a8f1ea2803dbc72fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a credential harvesting lure. It presents a fake MFA or one-time code confirmation prompt to trick users into submitting sensitive information. The document contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a phishing campaign designed to steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/sacjacfkslic4b3rdail7eahq2/51377534020.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210703_a23af.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0477ba6dc1eaecb9205314694678e120/18181204010.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/94036643067.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/i8ec3odmrq5mpjh7ekaplo8fjo/64226951968.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/493928c5359437f285e9a1483afd8e7d/57214930902.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9ee6b2a7---sewonijal.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82e46bcce---fojetubezimobu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5937ad38d---61528761546.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/03012aac24f546c0b9f60442ad1cd383/nenemeri.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tqptc5lhm9onoa0au3qi67qvb9/92393359862.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/lumiwado.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cdb095b48---sesuxatupifakatut.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xonom.pdfIn PDF document text
    • https://soechi.com/userfiles/file/kefujepirisi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5dd257cee---wugetoxabawo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8eff3a08---kinaxonixiranag.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4ae3151cd7dcbb887bc4c8c13cf41490/73417127429.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/sizug.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rilogorupanadu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fa91faded11c103de11c76e3b6df7af6/vaginoliforesewub.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073d11e21858---56837226294.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/vipabevatepeputofenogamuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=american+express+confirmcardPDF 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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 17840 bytes
SHA-256: 51e46edda1fd829e4c448fa101f12cec9c03c88e854ceef2ca4bc84d3a20cc0d
font_02_sfnt_off00012a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 10720 bytes
SHA-256: 531a264f9328e73144b8c70c48a90f55e97aabc29d6a75414da6b49ac136d513