Malicious PDF — malware analysis report

Static analysis result for SHA-256 a363ea2094aa4019…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 08:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60a7c37e856c744a979ff1024190bd1d SHA-1: f30e54d822bc88bc1c367fb7fe2bc63f9334d127 SHA-256: a363ea2094aa401975352ef0cda96d585c82ce8c9803cb7d89283132e088c685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://grupa-energia.pl/attachments/file/87724419662.pdf In PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-02-05-49-46-16.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/32766686801.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161337b44ab72f---90951620353.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/29288574374.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/gekitafadudemeroni.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/74094912062.pdfIn PDF document text
    • http://pb-book.com/user_file/file/ponaruxop.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/1201350865.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b039251b5d---52487136313.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a54352bbd00b3db9c7688eced63e910f/bimisuxakiruripimabobi.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/98665776613.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/teleremuku.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/505ddba299125253a6887ec65df10e0e/74299540797.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/68113806547.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/79687756623.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/foriruge.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff81c6e19d---kavofox.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/luvabakiwezojinujotimoji.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/46099803310.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/lesarasekese.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/loxiloxer.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/romufebulebikulidedofaga.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/gejatobalire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=switch+between+chrome+tabs+shortcutPDF 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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 18400 bytes
SHA-256: 8ca00f3149ba71a37a00c39b06d08ab72e2e1f3d38bdeb9b7a4da92b83483298
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10848 bytes
SHA-256: 653f930b8030c0881ce8c6236adefec5166b66821e108025715c05dd24c21dba