Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca81ff02dd2494a8…

MALICIOUS

PDF

88.0 KB Created: 2021-08-08 23:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b444407dc54d0f61296bc714ed2507c SHA-1: e7adbd3d0e0a4d2a7319753e4fe699fcf4f0c74c SHA-256: ca81ff02dd2494a8868c4850ee8ef7f9cd7374a33bdd0f25cc0343d55637e9aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/95cc74ab65c69e45142aedad842eedb2/93660787973.pdf In PDF document text
    • https://xlspandoek.nl/userfiles/file/rozesos.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/4vor04adl1b72kdiqos601ovpp/fagarezikitoruwuluzil.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4070e043083da18e17acc071816305f/purar.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160733842bfd24---11767895953.pdfIn PDF document text
    • http://unseretochter.ch/images/file/2691830577.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/27795073006.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086118ae6069---18797756783.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0aa91622---natewa.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/tapeg.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/nizeta.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/58839548553.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/50628740171.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074995e8485d---4525898405.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/bobobedivoluwake.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b565b38493b75b842438a580cec2c03/zozurafusabuf.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/muxapawifadiwurumixozeza.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d104b312a---jabenubude.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5bc5db721---jinebijizowazaki.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/vuver.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/92391459020.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609edba32a360---49146023039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hand+embroidery+basics+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec3742b09---nilafidosutuvapelebo.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_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10880 bytes
SHA-256: 0d78725a382a871763634b13deaad81823e1d6504d8aede046a6a56116ca8275
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 17100 bytes
SHA-256: 38eb548896e37a38ce80dba9db8f24ac5fa20c550fbd78638f2bdf1a03634d42
font_02_sfnt_off00013789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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