Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a31d53e5bfd49…

MALICIOUS

PDF

82.9 KB Created: 2021-07-12 23:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ac622e7b10bdd0386550742930c10365 SHA-1: 5874c0a1601f41f9cfb5b084ae94ffd409964d13 SHA-256: 5f5a31d53e5bfd49f1793cf998392b34b00340e16ad4001249e0f5c7040898f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the link farm structure points towards directing users to malicious sites.

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://archism.ru/uplcv?utm_term=future+continuous+tense+exercises+for+class+5 PDF link annotation
    • http://watdoenwevandaag.nl/upload/57890824460.pdfIn PDF document text
    • https://parc-hotel.info/file/53799011019.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/psdpouo8r9kqgngfvbnp58p323/wazaves.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20d8b67de---tizadofemeb.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/498b1597be2cb7283dd41c9abce49680/dotepebuxuvebetewose.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/54910245686.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/44773643275.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d448a7450e4---69925800139.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/36908971667.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/28765262611.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/31a62d87a1ce0a807ad920194edc4639/5944153532.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/35642636805.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/70102438507.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fa0107a126c7a4558e91098af45de1af/35839887996.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/zuzomufagiwebemigobujunad.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nuwimilaxugusut.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/63644756762.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/27449849079.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8f18ad42c167b518aed14d69a5d28732/60713334973.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160802c9f6e9a4---24471898.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/54619574910.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/aeqa9hg0u9ab5c6lhmoqhj7r5p/gimokitaris.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/tilul.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/vutitujutomesiwo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087750193b54---13999180979.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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 10640 bytes
SHA-256: b770009619b74399e57cb46c9d17c8e168ea3209b0c8fd59e5d1dc6e4dc1f5c0
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 17128 bytes
SHA-256: 394e07909cd2f224e594cad605ad51c8ee6a6cf47950a1c7faef85f86f91155e
font_02_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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