Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d715c9d2af5aaea…

MALICIOUS

PDF

88.8 KB Created: 2021-07-13 23:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a2fbe7d486d7cb494e942fbb951aec8 SHA-1: a6e5a3ec68d6920de4033eeef7627768efac3cf4 SHA-256: 7d715c9d2af5aaeac58bdc8162c25f29343f921aad33ec6a4f3904964c013e8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=the+startup+owners+manual+pdf PDF link annotation
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/mtg9vosn8n9egtmcdilssf7csn/58845308534.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34d813fe8---59964423697.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9455rl28gcjbgngioith49v7hv/72467853735.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b4d71c40b6e47a27ba45056944ffff31/6034190310.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608158ac1f58c---pijajobuviv.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3be236f0366f284d6765f2ee6555ed8d/68507761801.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/86230341841.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca90ed7a8d---zapodowuvegam.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b99bf32c756f1f4b36e12e09814d29e9/7228290304.pdfIn PDF document text
    • https://ka-base.no/images_content/file/43136003589.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/89116509312.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210526152609.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/9741076653.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fa746a40a2f0a30ca60f4e7baa1c2b22/sireza.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/n0h106dtfsoh8jh05k7a064227/87615897285.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/seg04j517q8pfbig3u4e4361to/sutozafibogukofimi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/65c0392dfa039769b517b51613da8409/xuzikijenivaxepik.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/55945c0c7177f2959213b3e21463f259/woluvarakoxufise.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/krfembmqrdar33v4k8bnu94a3s/tabeke.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/teluju.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/58107117709.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/wolatibujorej.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160850fa7842e0---sajonudipadumexuvepusiz.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tumaxanoxaf.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/437f60d67a9598b6f225f317b763508f/9238137069.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_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 17100 bytes
SHA-256: 14b0c42718784a407ac086a10bf2848f1972c2640f908901abdb10b78ffd9225
font_01_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 10820 bytes
SHA-256: a82f009c0ec82026e8b519d713f9f83274409802894d9cb545c56cac1f0dfc43
font_02_sfnt_off00013c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1