Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b1594eb3f75e08…

MALICIOUS

PDF

114.7 KB Created: 2021-06-26 10:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1530074d25caddc15016211da486fd44 SHA-1: 232d58321f9b1583dd77663826e9972f36e925ef SHA-256: d5b1594eb3f75e087db83d0f08e17433d2108716fb60da45aa4120421cb89062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/62cc4c5a39b0989fe9266d5b71a1d4cb/68848201716.pdf
    • https://fceresources.com/ckfinder/userfiles/files/bikomenifojogonodofax.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607265caccbbf---bofawepakemirukit.pdf
    • https://srmhospitalities.com/images/bulk_images/files/jujejazemurexifow.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afeee4eafaf3334a4c45561986ed28ef/viworo.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083287784d73---nusazenumaladevuku.pdf
    • http://www.klimavill.com//data/editorfile/telotofojibelavope.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc13ff3731d---55935538787.pdf
    • http://flatadministration.com/uploades/fckeditorfile/fedoz.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31311eca42---dotafumilufevigosekuwik.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a47494cbe23---wubisugudalifomijefot.pdf
    • https://ibextrail.com/editor-images/4336473949.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6cafc40a8cf379e951b9a66573f491a6/jibenanepadikimud.pdf
    • http://ksboutlet.com/file/files/35229099388.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6q4vlfuuqu85h9knr8iod5ai66/40302562052.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/9e8a8dead8a34bb88dabfe2623242f95/livatokugadurugisupuxa.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kjrdka375h7f04mooin1rrch3l/10994194021.pdf
    • http://sklepjola.pl/userfiles/file/52369550220.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4e7522d04b4cb14f9c96cfac9a0c034a/jobodenisofet.pdf
    • http://volamtuyetthe.com/userfiles/file/54457439920.pdf
    • http://rubensova16.cz/files/file/89504973025.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=9th+class+physics+numericals+solved+chapter+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015aa6.bin
d8de5c9abacd8eb0e44e0463ec900ff9a562baccc390cb9a314a3172aabc79f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA6 18228 bytes
font_01_sfnt_off00018ae7.bin
158e03542f05cec6861ee0a4a5510c55d66f8b9e5971772e5478ba8818812f28
pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE7 11300 bytes
font_02_sfnt_off0001a557.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A557 16792 bytes