Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3708a918dc4e6b5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 00:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4da819eee7261c49d6587f5d3d9c4fa4 SHA-1: be7af8d962efbca02b5c32abc03bddf189cf7f5f SHA-256: a3708a918dc4e6b5097b8a9b77d4defd6b581ce3b4ce71c45c44ede4eb8071be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=android+into+webcam PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150dfd7663d5---vonepazematokunodutejipux.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/vojipale.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/96203400198.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210917075117.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161351a13eb85f---fikovetunuwagisekasasorin.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/rokufadu.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/manodu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/4464809799.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/60794981960.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/9126249569.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/6065058207.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/87761812988.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/letogegogopefivizitejodak.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/wajexadenez.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/92577558711.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/pusinedimupe.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/21966789941.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/81578536540.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/benaxumuwebofara.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bilewevigonusalovud.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ad70393d53ab20ebf4234a6fe97b3a33/44039299446.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad33e8bb9cad2b9e7ba0671a991d538a/jeperovituveg.pdfIn PDF document text
    • http://honghuibio.com/d/files/pevozokulimobiruk.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/55660717648.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/65158180689.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/gekakaji.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_off0000b126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB126 14956 bytes
SHA-256: de005423dd72b0cec6dcd86fc90ee344adc11e866ae0a1fa352216abe2cddd13
font_01_sfnt_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 10524 bytes
SHA-256: 2d8dbf12ec8f27d2e661cdf58f9e6825c814fe3fbf28f714525d2c188ee1b2ee
font_02_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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