Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef0f7f59d15f461…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 21:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e562be21ac587b8029c5dbedc6ecc57 SHA-1: 256caa21d5c7be3feed4ab85714810b1a655c0c4 SHA-256: 3ef0f7f59d15f4611ee66463acd5f83909ead56005315be2907aca076d12d8f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in one URL and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=shadow+fight+mod+apk+unlimited+everything+and+max+level PDF link annotation
    • http://thechelseaff.com/user_uploads/files/96090335546.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130458a77e28---36436768611.pdfIn PDF document text
    • http://koddous.com/userfiles/file/10704180735.pdfIn PDF document text
    • https://e-midas.ro/files/file/55582242513.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480957df79---voloxujizesediwidaxexu.pdfPDF link annotation
    • http://fairway.cc/images/blog/file/lasuwotavogimugepuji.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae5acbffe---fumiwuji.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/49501818096.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/dulolefotepikevujupuvigoz.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/duwefokevulaz.pdfIn PDF document text
    • http://generoussecurity.com/uploads/nevabuw.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/bozat.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/22542803061.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/gozozuji.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/56208566864.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sapajafa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/13146572365.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3miues3ns8vs6urebqdki3i7s9/xikuvujosalukoxajekefoz.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wiwazoge.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307de54519a---mofisigutil.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/besujokakumozitan.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/mexaxivisapuzat.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/noxabepuxemumumedujozuraz.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/daxovoxilobinozakes.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_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 11412 bytes
SHA-256: 924a27b628f6fb429b627421d69684dbd14cf8b1ae9f38d0cfbf4f434f7230a7
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 17668 bytes
SHA-256: 3d4ae5d8ac4f8563ca2d67a24d2cb4f76a97d4564b2430e722d029d5b3881d9c
font_02_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1