Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e98d41eb2ac9b31…

MALICIOUS

PDF

92.7 KB Created: 2021-08-07 16:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c984100ba72c336fee6bdc55830ff0df SHA-1: e58cd4ab566c6ac8cbf309f023004b992b41b02d SHA-256: 5e98d41eb2ac9b31e42a2a5ecdebd31b908a3c35d86fc42b97dbaaac383a5301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm intended to redirect users to malicious content. No scripts were extracted, but the presence of external links and the ML/ClamAV detections strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://behbehaniprojects.com/uploads/files/44400640591.pdf In PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/wuvonaxaforirimugotimaw.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7635858c---xarodivupowenabubudires.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/81232237176.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbbaa47f4---siditajejibunowegowozo.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/36582323679.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e083a4cfaa---kinizatijovu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/18dc07e8d9fe633fbed60b23e215104d/60365328782.pdfIn PDF document text
    • https://rcot.org/userfiles/file/52434647916.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f63e021c---97993132547.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/82290571271.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vorowudekefoso.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/hmbhs74uu8gopihc81ahpbmsd3/80255611536.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/taromizatewar.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/24abm2rdkafna5uhpldpnaeb40/56623692081.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tiporefenokedulirexim.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c2ad5aa---84949354983.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23e9aec3bc---7488889012.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/87341520660.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/85221088e55d305a1ea66f493269e88c/5469131911.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6787aafe03b31a981b6a462c72147b0e/29242020686.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a4a8a55f3---gozapidivovupivade.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75698d5302---56849224153.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e276bd8322ca005f12e4c23beb66f7b4/19171564413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=g+switch+2+unblocked+games+24hPDF 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_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 11372 bytes
SHA-256: 78d0bf08ff62a9c5c8c4f6144c594d08c502ccbdbd536d9be46b68d94ffb3437
font_02_sfnt_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 18916 bytes
SHA-256: b2311772d4213c3d6bbc2a33f34b00dbf55b0b423a3d5eaa20ee1f3fe94a9bfe

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