Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc153fa6fc274a0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 06:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f22782fed37b85891a0e3982960b6e9d SHA-1: 4b0e4595a54efb880a8690312283a31c5bb1c9a2 SHA-256: 1fc153fa6fc274a0ee1d38451c52887373e68fcaf42533cbd13c97b7b903b1d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the PDF is designed to redirect users to phishing or malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://factinet.com/uploads/files/bimemofagitajiwolanugaza.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4oq8iaqcn6hcsv7k2h5kc6nj6i/woxokobirekeguto.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af810b90bd1---88682832071.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160993988aa770---65721535994.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/lowojikazigan.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/13606948189.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pimowubedamulepowubizen.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/24671170753.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/dijatewodolafijawezasubu.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/40476714053.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3o6e8blsrsba277cfts7l358tj/rizunuselobokunafo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b04edd4ac74---29558794384.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/joleweveponifamoxunadima.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/9699634499.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xesofiwipegovowovof.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/gezurabada.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/xafokijevopike.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168e5b55db2---21800824583.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/pivexiwubenotogazemebiw.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c54d17d1---59748686957.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/786771590.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/72471325342.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/53027301285.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161077f114690a---savaw.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/kozajefoposupuvo.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/86641452519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+resize+a+pdf+using+adobe+acrobat+pro+dcPDF 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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 11128 bytes
SHA-256: aeefb1677867c998b961a86f43c95ef80cf95c4018bcc4248faf4d55dee3784a
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 17276 bytes
SHA-256: fbd12030ce0388fb2d0be1baa8837625f6243f08fdd9ae91210818b4ee08b2c8

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