Malicious PDF — malware analysis report

Static analysis result for SHA-256 58289ff0de5e3fcb…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 13:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13e6ee34a4c04adf872ee08fdefc19e2 SHA-1: e974efcf21e572f2c2a876f6b53729674087e729 SHA-256: 58289ff0de5e3fcb5226e62857b5689fbd2d6ba966393203759e8572b2c65b99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites that appear to be compromised or used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://centreforeffectivecoaching.com/media/file/todopumewoxexizizubu.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140948526fb9---mabusisufarufi.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/wevenonakevupoxo.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vamomajil.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/matitimanuwosu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/bediwev.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///ganuketu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9d1a2e8940d71bdcc8a1830d4b71743b/tutajivililavofa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vigupubupoperaputimutekat.pdfIn PDF document text
    • https://jin-ji.com/upload/files/54134892807.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf20b25fb0b04befef6062602ef674f2/judulawefibebejod.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428c6094354---90289757424.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/91263485424.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210905114606.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/vavupute.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/dologatetumumefo.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/90692152354.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/jizezopibetetimesakebikuv.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/mapavujunojive.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/rowoguxowotelawukatike.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c27c863b8---mizutuninusipiriwitiv.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/14812374276132bc4530f1b.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_12E0B6AF068EF387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+block+someone+on+androidPDF 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_off0000ba71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16368 bytes
SHA-256: 405e7b2dc90cd3405c8d14ed20abe9f9c8323c7e3c54b6789e8b42492a4a1c80
font_02_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10956 bytes
SHA-256: 16978af10c6b778c04686ba4e4bc7a71050b5284a90a0e1afb59340254cca775