Malicious PDF — malware analysis report

Static analysis result for SHA-256 655948824f85460c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 11:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e8f3c5eb6c42ee52cacb86bbd7de0dc SHA-1: 757e031dce10fc648d4c2b9f5130fff47b925ce7 SHA-256: 655948824f85460cbe1b2824bbe556746634d511c57b13a3abec1cad626cac14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfea9b625---detegudapiborad.pdf In PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/27182635501.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/zekalupufasogebine.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/36590676013.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/iqh4dtdv3msjsps6spt021p8th/bunaxorilidegasaj.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb7c2003a---givajubap.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613187923c282---64809221988.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/22566519528.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/7706791246.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/fobifunilesola.pdfIn PDF document text
    • http://cloverdiamond.com/file/77903047453.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c89338be---xijolotamaxofiropu.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/tegemiwipeletokufizoz.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/nufufijos.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/renivudazaxik.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210917130237.pdfIn PDF document text
    • https://invision.buzyhub.com/files/26459450037.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/1232702488.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ad0ee21c0fe2737c702c190d4abb6b72/kopag.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/32096074860.pdfIn PDF document text
    • http://creationart.hu/files/file/72839478676.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/24304559539.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/pulijimerasafazob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gif+player+androidPDF 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_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10380 bytes
SHA-256: 007d529c7d41487459a9c501ac0da9f4291a8e9c4195f67f1be3d34f0e8f4620
font_02_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 18608 bytes
SHA-256: 6c442a739dfa72b65d08a449093c7ee87c3d87695f9e1ef2c0d2c1485b4d6293

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