Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f8bd8f5e72b601…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 03:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd4cec19a5fd53f7a3f4a7125358d9ff SHA-1: 41e78a3b9fa04ed16ae2adc561b2dee3bf27542b SHA-256: 16f8bd8f5e72b6013cfe6cd8320a34847a8575e4be6b83c52dbda91cb46adac0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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 https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ea80e5e395642c102aec6d8d4f90ed21/kozetokivikalogase.pdf In PDF document text
    • http://savaksangida.com/resimler/files/49505753716.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/61302944169.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143fc3722635---69928240215.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/69167754697.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad6950927---95415580728.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/37841577636.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d2c93627---57861870200.pdfIn PDF document text
    • https://begili.com/uploads/image/files/raneramorupevejonifowib.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210905231332.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/39361705699.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/67451236643.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/56491567055.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/99403376018.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/fezilez.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/50383740434.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/42106799932.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/7511228305.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/81435753371.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/fapijopowefifad.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/tekajizipuzi.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/63520331492.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ejcslh6ae0pv13vdppcm62onid/depuminogetew.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/didake.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/98372020878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pubg+mobile+apk+updatePDF 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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 10696 bytes
SHA-256: 62da2cccb06a1f8331a8dc1374dd7e90b2364208ed17509c1cf2c91c00d7d96f
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 18000 bytes
SHA-256: f5befa27e26afb977ab24118a9ee4f46fe9d1ea12252914f23d644751b931b0f
font_02_sfnt_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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