Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55bc777a9ade87c…

MALICIOUS

PDF

118.3 KB Created: 2021-07-30 10:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5b1f2755dfcad0acd6d47d3be3014d5e SHA-1: ad276288fb2c1cdf1fbd6c1a3de0d431ceb073bb SHA-256: a55bc777a9ade87cd1bc1e856ee84b97f3b59f93f5d5900d79d54f8e659ecee2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, consistent with an advance-fee scam lure. The document body is heavily obfuscated, but the heuristics strongly suggest a phishing or scam attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc39e5c389---75570700820.pdf In PDF document text
    • https://ajitcoatings.com/uploads/mitubugepamuw.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cojsdjfqml98uh2pcb0tihrglr/28503660275.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/9217369336.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/42939266495.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/kegulukobew.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4ea947e3---93099194429.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3119qvge6qq1figs0un3cgct4n/vomomomugitozomude.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e98bb0a129e12555b68f174d253e4fef/50598807975.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/48a52a48531bd1b796d76a3579fccc39/batexejuravijubugukew.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/wevumotamidadotonaf.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1oocbvucbq95t675lbj3t4mpq3/xodusizapivuvidedi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/17f0cc11158fbfcdd76e2d86e066e2fe/mufuworibuvokivevo.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xuwixejirinele.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2caf55db78---moxarugaw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/61927154120.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ced0193ac---susuji.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/58034677083.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/wulimodowurikukego.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/41083289712.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/sibimidolaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+anointing+breaks+the+yoke+pdfPDF link annotation
    • 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_off000169e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E7 18080 bytes
SHA-256: b88d326a7487c924465234c74a06bdc8a738028e87d4e36729aba9c800704635
font_01_sfnt_off00019920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19920 11040 bytes
SHA-256: a836b14b20e4a71d371e164d99e9d717f1cb24ae18bbd4460c7dcf56d2fb95b0
font_02_sfnt_off0001b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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