Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f02db0e0e00170…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 06:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d9fc27cf1465345f1c7e62d0771595e SHA-1: dc4b0d720bc3ac7d68bf753a80650dc5023d33c1 SHA-256: 64f02db0e0e0017016e4058ffffbba547d6ccebcf6e02a71440a701fc2977018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=abu+dhabi+to+dubai+bus+timetable+pdf PDF link annotation
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9e9724856a34b543f40e7ebc547e9f17/29564659991.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/51821eb3fae727e8191b83b5c29a7560/metoxawexilenipamado.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/79fcc0dc80a346bbe34f048c35d4eb96/52646074766.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/21143194739.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/iqfpqfhst89t4c4gr9lvj2h0ab/6452496881.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1eb20681bf48b25958105422d809c6f6/ruvixoremuvitefa.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb296ec5913---72815487285.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/68417592344.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f7ebd24de5952911222f037a796b9bb6/pudexopu.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/faxazedarob.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a595d1eed6b---wakegubumeno.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da5732d4cd7---39472744435.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/jh5vi148i0is9min3r1rah8ag7/paliwakigoj.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/18800740476.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/62596185170.pdfIn PDF document text
    • https://mavibusiness.it/file/31729479269.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77edebfbb4---xufuweloliko.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/11414518766.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pigov.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/94283244273.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/75d5b4dea3845c6f304ba6cdb5e29ff9/2835211288.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ef677557---vajafujadodisi.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/misogi.pdfIn PDF document text
    • https://papiratisk.cz/soubory/84819114156.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_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 16748 bytes
SHA-256: 6a664392dfd2dd67cb03d9f9bb7f133fb127f2764c6a2565b1e6c60275f14067
font_01_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 10780 bytes
SHA-256: b15c7966d44b9358587d11e5df6e06b6493861a36a31855de1f678ad8d282899
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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