Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e5b4a2a117b1d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 04:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c44950ac4d06f8ba339bba7a3f15f3d SHA-1: 4fb7eb1ed23df99ecc312459d2bff69c17a2b185 SHA-256: 1a1e5b4a2a117b1d468ba027ab9d139d989e70e3964c8753365a6f59a36f4e59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely to download further malicious payloads. The presence of external URIs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=can+you+install+mods+on+minecraft+mobile PDF link annotation
    • http://greenearthgardens.org/userfiles/dogavigaguwamixumigat.pdfIn PDF document text
    • http://hla.vn/upload/files/pigusevizikimepupakosu.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93061962467.pdfIn PDF document text
    • http://gestioniarmatoriali.it/xamokop.pdfIn PDF document text
    • https://schmitz.cz/res/file/sowujez.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141127c91c25---79806783821.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613757335ad66---46088355632.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/89096286992.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e16ee406---mowatujibokivaxema.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210914112733.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/mixazubabakab.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/gitumopogotumijuzurikipe.pdfIn PDF document text
    • http://dges.in/userfiles/file/tumojefopewibi.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/74109512266.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/24749552391.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/87675676663.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210904112854.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/49404710514.pdfIn PDF document text
    • http://melvin.cz/data/91767948216.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/repowegozo.pdfIn PDF document text
    • http://spharma.ua/files/file/zurowusi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0476364a76466d7a78d508c546977096/82937449051.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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 17440 bytes
SHA-256: f34bcdd7b6b26f5b7e09aef7cbd60a2e907777e9057d72a92d571990942f48f3
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 11020 bytes
SHA-256: 7ecb110b9802b713fee602608aa699cc45722059aae3a407437639e999b9045a

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