Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38fa52554734bc7…

MALICIOUS

PDF

84.3 KB Created: 2021-07-25 23:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eeecae2e4ebc5ea6228b577b5261487f SHA-1: 0202034be7a71fdc055ce7d9d49d1f037f70d7f2 SHA-256: a38fa52554734bc737b76db7bec3d283e2f049178a82f15d9753a64c866397fd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to phishing or malware distribution sites. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://mictrogiang.com/userfiles/files/78983932880.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/tidadusaliwetajabu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c91272b5a4ec93011c8a4be5548940a5/mabudelob.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097d9768f4ee---38890092897.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ralelatujojav.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/nemanotarivez.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b474d991d3e60aa515fe17f6557c761a/32233525693.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6ad394804b71f61dd930ff5cfcc6effc/tewodakakepes.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/xumawe.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/wimasovebos.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/3acogc99l0icirliom9feslhl7/nekoja.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5ca52eccb.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92e2f17a1---rovodamefaruvasegasek.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/rilegemobokadigedaniv.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160895cbd0dab4---83607902204.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb2bc5eb70b45895100580fba98bbaee/logewesametojodevazixa.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/21019205831.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/tepurojapatoxuwixutuzaga.pdfIn PDF document text
    • https://anfauglir.com/images/file/94197558513.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/92862794722.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/99918150760.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3aee434a75a903810e6453154a62cfb9/71003751440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fracciones+equivalentes+de+3%2F5+ejemplosPDF 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 11432 bytes
SHA-256: a34913ac3a54b49e1a3811c8fcb558b5e6b3c4749424bb44c95a156367423b92
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 17876 bytes
SHA-256: 48d4e8c98b3e56f2b605849e2455f6f4857935ff338e2f9c4f984f4c3c0bee6e

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