Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd551aee491298b…

MALICIOUS

PDF

111.4 KB Created: 2021-08-08 12:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73933f5d1ebe73e1d32c04703217bb0d SHA-1: 770f17cbd4cf4acaa18200502e9febe22a8106e4 SHA-256: dbd551aee491298bf81f065285f002abba7ff91b761f76c66f6397a7c86e363d
256 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a lure, potentially for credential harvesting or to trick users into downloading a password-protected archive. Multiple embedded URLs point to compromised WordPress sites, likely serving as part of a link farm or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=real+estate+express+final+exam+answers+new+york PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/becdf4c5eb458791cd1b9c35f7193796/vafabomosizimutezo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a06e7ec3a---64587372674.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098847e69f9d---73219845385.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/11622006963.pdfIn PDF document text
    • http://yongqingtech.com/d/files/dolumomadolimivewobagupez.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed04bea62---97158504704.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087694917dcc---58579808633.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/tixibexosar.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ak8sltvg6gbhmfp98nt7qrkp6i/62286556241.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/25416901957.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ea733343477773724b8d2752d4e4cb93/22970596001.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079af7aececc---guruv.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ab489ac3---13959263184.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a500c3fe9f---givanerinud.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/tejebafef.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/94284832520.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090290ddd1fa---gugetugolalifu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8053f67ec9---41842581806.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7754cf7e4---fewipisefuvinuzulaju.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vn8ccqh6nue0qgnl701k9hd024/nukaf.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102dcd300052---xogudipepavovox.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ibfumen0fmfva0sv2i1h9aft14/28858681302.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/vowutan.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/rufavizezevo.pdfIn PDF document text
    • 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_off00014f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7F 17616 bytes
SHA-256: 387602fe9b1e475d26ae1e7250c49b3e2e9dfa0eae76002f7d27241827876290
font_01_sfnt_off00017d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19594 10956 bytes
SHA-256: 9ca49f1d92e4870bafe81034c417b61f034ab8dcfac8f17a759e305b6e2fdfa0

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