Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f992b49fd054ab…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 15:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: da691e6f031c64c759a3e75a053ed858 SHA-1: bc8282828c3fc87dd2fd990b8040de5955368c54 SHA-256: 77f992b49fd054ab3c1bace01ee7ba6187fa8fcf5f21d6e355d03e1da273c58d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and disposable hosting sites. The document's content is designed to deceive users by posing as an invoice or a request for recovery secrets, aiming to trick them into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=how+to+see+digital+signature+in+pdf PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160727075baef2---70770604698.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9a5c3e7c53b431b66e579788811325e7/pejisuduresarisoweri.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/16339181447.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01575a90e---42321731022.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4b690bql62ioe4acpjf08jh34e/34530334254.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/napegowepexa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7729e6019---11124076587.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/92230088646.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/eb045d05be1f64e2d46939466785d477/zudozuxirulozasubibedekix.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c3f06a8fcb07dd08b8c326cec42b46a/kolanidawaresawivawovuz.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210616_6C9A6D07F753ED44.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56e24b79c---goxeziporunodifeb.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/saripadovewasadodopibunu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160901b669b3fb---vokixuvokovajilafezefi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b1d0f0af5906f3a5af8be1bc8466d97/10872741736.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/90793706985.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b426a0d84---xilopusiworufosurolevaje.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/nedasojuj.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/82448881977.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3fce921e0331f2dee2b24737f4ab7c22/wanad.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620925401.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d35f06200a966ae0a8d534d189db83ba/29131867320.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1726aac0cc4415f1cfc86c298b417ff4/19249948182.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/nilubedisinusa.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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 10852 bytes
SHA-256: 6f58999efba2f444db36f9e5260656928e10c629f544f996e63ea56bf69c127c
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 17196 bytes
SHA-256: 28b9facc3c1d350d9075f3a9505e6047debbf3f6fe3d3fbdc657598fcd8a8693

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