Malicious PDF — malware analysis report

Static analysis result for SHA-256 e877ab0381e8e30b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 09:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38aff089fc9bb61d1c470ed6a4e5f900 SHA-1: adbedb1c5a34779e177540e49c63a3856494fb07 SHA-256: e877ab0381e8e30bfb6f01df22f7cad649403b74df7626653a5a52c915d607d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of external URIs and link farm characteristics strongly indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://sanruouvang.net/images/uploaded/file/gurupus.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96f696cb9---85601619831.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d9a537e983e2cfd42d49c3391f9e3464/15493131447.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d06f0305221d3652b45b21bf4c1f2cc8/kejorekixaxibov.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0e2d4a228fb685e285710c0c069ed896/25299453449.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/65955620495.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sobp1lohasjvgp31t04l42r42e/46656953829.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612557ffa6e88---4476659841.pdfIn PDF document text
    • http://korytnica.net/data/files/51947183848.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/nulegiwa.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/xaxinavolaxofupof.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/76617a562f882f4f57104f131254ef82/4933402503.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/rajuwalalemejas.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252aaf4bf---75839948036.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/16795691657.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/91998673341.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/94857053106.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/25780626333.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/6642592045.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/b1ucvlm74th7dsf2dotk6e1pv7/davajivarafu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82f4eb5c8---gofazopusogoxexore.pdfIn PDF document text
    • http://cga82.com/admin/File/gepuguxunexisizipofedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sika+grout+214+data+sheet+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_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 17244 bytes
SHA-256: b091945e1a9804abd8f57e8362bdc5062f6434acbd6e5ab887a1797ab213a4f4
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 11144 bytes
SHA-256: 88357aa1e6b99dcc003ea70e673316ee39ac622df89fda0c3c1a97d6b0a247a9
font_02_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.