Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d4daccff6492e7…

MALICIOUS

PDF

82.5 KB Created: 2021-08-06 07:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e37b9b638adfcab4e56ef0e80937e98 SHA-1: f2c7014c649603cb3afc12c085d0449ec3d9743f SHA-256: 48d4daccff6492e76ac6df2664e776db6e16d86f4d7a67483497844c2270a3b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to disposable hosting and compromised CMS upload storage, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with known malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608367232632b---55672607624.pdf In PDF document text
    • http://archi1919.com/smlclub-files/file/32711276383.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5dd60975---tonapudotu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/wawiroxapugomod.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d439586440---kukewira.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b460ea9c502---mawutepoluretujukufo.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/taderegasafivojasijarase.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/bejetutapufowigewa.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/30477768716.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/65520370946.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/86931736824.pdfIn PDF document text
    • http://ha-sine.com/d/files/fafozufazovidu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31817af7a---42804004171.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4d629fdd---vijuparipabufan.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16095e38da211a---gosugedazapawukafuteliji.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/a6nsj88gveht2c01tfqa1nq1mo/45071138554.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ag3n1t6qt4ij8a8vgcus81hqb5/buvufinasidedokigone.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/devakot.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/prcivl3b5dj5qbcbgpu7f75e58/katozuxafesebidajazo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6f80b772---85743759486.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/s7e8v0o2c0s2uq8unhpq5fu2e3/20688997398.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9afe8851365ea19a0993f24437e25e67/nipinenozazatiwupoviselon.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609711b1857ca---98949251139.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a351db4a9bd---68657314663.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/kogukajepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bollywood+4k+video+songs+download+2020PDF 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_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 10956 bytes
SHA-256: 31e0ab8e3f944a78c1f2175272aa393fbb931e091ea0a7e63b133c2d3fd46f1a
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 16236 bytes
SHA-256: bfd853d5b72b39ba88a6756ea6b82c27267f0d8ddc02b12de95e47e699e7374a
font_02_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1