Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5dfd1375762c3f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 01:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a2c8028906c8b01f4d7b1ee1aa9ad23 SHA-1: a89d00e4ff2bc525f0ebfb335432bfb65cda7262 SHA-256: 7b5dfd1375762c3f8ea1b7f09ffadd5aab1ce6a51b52869a2c1f65c0f644f069
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous links, many pointing to disposable hosting or compromised CMS uploads, indicates a link farm designed to obscure the ultimate destination and potentially evade detection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chinhsuasolieu.com/media/files/sesozof.pdf In PDF document text
    • http://belean.pl/userfiles/file/74833199083.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/nonubawunuxexiwun.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/sefoxatavufajojirubojebut.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/81618161490.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/rozoparavefolisigasimapir.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/faxizirazapir.pdfIn PDF document text
    • https://laser123.com/geektic/files/fizex.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/24210315070.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/38475662189.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/xigokesesureta.pdfIn PDF document text
    • https://norservis.com/files/files/powuzepuxa.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/72583537004.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/96224132725.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/67019018612.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d156c36df---pezesagowomafetafiniv.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zaxuxuxefawon.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/dubelesovosufoxupid.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda31beac8---14324263193.pdfIn PDF document text
    • http://sswjeans.com/files/93379996636.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/filudejebadot.pdfIn PDF document text
    • https://dm288.com/slicice/file/mejosu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0adcff23e65cb1ddf433f97b5ab2fc65/gakifowuxone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quantitative+case+study+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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10688 bytes
SHA-256: 083f7e8e84bbdc944912cc1b0e21e9a3cb32e5cdfc00cd569b1539d666b19f76
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 18032 bytes
SHA-256: 4c056642c4de2ed8b63adecdacd05e8b668c2d8b585092caee48d1f44cd2c44b

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