Malicious PDF — malware analysis report

Static analysis result for SHA-256 df51e7a10dd7df7d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 14:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9888c24d894578d4d4b1b25e6a208231 SHA-1: 8dd5ee4996cb1bb0732d82d465f4692dd0583608 SHA-256: df51e7a10dd7df7da14cfb760964e0ae42e991e903dff12e271fb2d3af44a14e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document's structure and URL distribution align with techniques used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://anipetkingdom.com/webroot/img/files/fabidoxubesizuxufi.pdf In PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/78436570480.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/15825550982.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/mepurikiluxogopugonepumir.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/21048893516.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/kamuwemokijif.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/dexoxar.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8028317b02224a01c9ff1cb9c86f5f63/74997248955.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210802225825899.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/keginivomikafinufawaka.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/73087599880.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/gifijamuzaxof.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762f1812b95---pikise.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e232efb6f---forewulez.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612622973dcae---24373880164.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/tjkqe48vqr7cq38jp86qa9kpp1/xodujitonepeme.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/mazidibawudevazigemuvi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926a770904---6694597783.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b452238c379---65335808677.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/57cb6d51cf956ce906f55a1889875680/kafiju.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/53964767324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sister+wives+the+basement+wifePDF 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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10680 bytes
SHA-256: da7dd10c404154bd42bba057748fae724887c262b982d62569c3e5adde19a551
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 18140 bytes
SHA-256: 7ec910f29ae7b8aa72fcf8942e0ec2afaac145740c8ff6c9b0a882848fc33a75
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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