Malicious PDF — malware analysis report

Static analysis result for SHA-256 76183574ace47b8b…

MALICIOUS

PDF

88.5 KB Created: 2021-07-14 05:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 98f8955ff539e13b9f947e754653ad3d SHA-1: 80a2bc1faafac894ff4f1627e54a6e1bbf7c426b SHA-256: 76183574ace47b8bf0feddc4afd27ef3f7011d9607fde91a3cd93e3406d33aa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment. No scripts were extracted, but the overall structure points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=spike+out+of+buffy PDF link annotation
    • https://inijariku.com/ckfinder/userfiles/files/zukutaxowuza.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/kusegi.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/57865379610.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/24733205586.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d2bbd207---vavewemazenibexulutureg.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dazedubixuxerejagezipoguk.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bede4f893---supisiwafuvetalitefub.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b0f22c1d407509fa133c84a1f2e29c0/53494143202.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19152774b---risajutemavasu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3001e74b---67589023691.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/52932779000.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/nerasufo.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/59a8d1f809cdbc5767f87fcef3c898af/juxomiroruxivujiluf.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/vuramubafajimini.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed73a4afb79---49548011954.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/wesuzexekemotomi.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/491etlqo4vu4d0b5udjqkbv93n/57685826557.pdfIn PDF document text
    • https://tadimtursu.com/image/files/fuzeguzilirasedutod.pdfIn PDF document text
    • http://goref.ru/files/file/78790274764.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/jqtsjjbtihm7pbgu5ism3clkjp/99755631754.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/25074423781.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c930153f678---94999637317.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075441ee3cdd---69640390125.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b8b5ca80---37892150853.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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10292 bytes
SHA-256: 054b263cc7048055f06f6ebfdce1772542b167deb9b70e2cf47a9fe139200cac
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 19928 bytes
SHA-256: 3f7979acebb2701ba1daf05a1cf0a2fd6a52113816ae93cfc30ea40acec4f57e

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