Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d2aedae28218ac…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 00:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85dc9e25c8102f4ed800d70143599082 SHA-1: fbb0ad9ee0acbac4e770fdb2fdd0fabdd7689b65 SHA-256: 71d2aedae28218ac65767fc784fbad5f82fc52ce7e811a30e4aa03d17199d78a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiobaldizzone.com/userfiles/files/gasogajakarovenizikov.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6ce5ee9c8---pisufim.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mpmv79g21v6br01db537hqr4t4/tepijafu.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tipotipamir.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210627030013.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27721269ab---kirogewasatulusevozedop.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/menariramil.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6be3d65b3379e672ae95c9ebe6698ea9/48147501353.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/35547134281.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a07b6a50616ad2b32d56c754c201b0b3/9649774238.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/da0734a3c20b65affab60caaa9a26aa3/sesimisobuwawegaruxa.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/semevuvobijojikipime.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bopipige.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079d241069cf---28509117587.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6c668b30e49cc6a81b02c9208338c854/futulexekijifuzijuxidana.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6b00e8d29f3a95c45e87bb58e15b855f/jororerididoke.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/auh31oqb724hccuslsclk5sadh/kalejuvetusanineguxoravi.pdfIn PDF document text
    • http://eden.pk/mycms/uploadedimages/editorUploadedImages/file/judokufodiwaloxugam.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/tegexasexetanu.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/86907227693.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/46795959476.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/1648202502.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2905d0cbd3ce8694efd51c0cc8633e4b/ramidezawexotaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=linking+verb+practice+worksheetPDF 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_off0000ba4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 10948 bytes
SHA-256: 909a72b6fe4b591ef72fa85ee1740239e5a0ae015b94a9964adfe70e94e54c1d
font_02_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 16164 bytes
SHA-256: dd957039292c1d3509eb318e5f242b12e61662177ad1d1c4a3b163c011d58fac

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