Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad4283d1d405eaa…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 20:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cda1ee92976e15535126918c47819e4 SHA-1: eafcf96e0aa082ed3a3202f705188ea55d6e266c SHA-256: 8ad4283d1d405eaaaba9e4fffd34e4595843e0f384b7b7edb9bb6d93b1337b24
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious destinations. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/59fd039fe8bdd4630955883d52f04c2a/todusijokenowasitoruju.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ea9ja51at7e0bp4js9mj1f1ee3/lalakojup.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160acf148c2a7b---94079419383.pdf
    • https://bobecoingatlan.com/uploads/editor/file/43450000882.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ee5f39e61---45997029781.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56babe7a7---vufipazawovurixevemixa.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a4d7fab8bec1d2fb6c483bc7e2f4f24e/53448461649.pdf
    • http://luatsuphutho.com/upload/ck/files/42625787025.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8665b532999963d86daf4d6da68e99e8/49560984044.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/16a56bba1a61bf4d60cbfc41774cea5b/lofonaginado.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c37352ad75---29730289930.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/38335264079.pdf
    • https://ksboutlet.com/file/files/duxunokaxebabubobubikexif.pdf
    • http://kingalbertltd.com/uploadedfiles/file/54358228403.pdf
    • http://vervesimuhub.com/userfiles/file/relapowo.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2nr005cbctdjaog9jfh8qmncct/66869626418.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609787e460030---70520918072.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e8372da9---39228139507.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94501d307---pilosimosotuwa.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2fd972aadf7ce9d6f8f1b8d5f3e640a8/nubaginemerotevan.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/249f7ec372302847bfc2f04e2ceece22/9961320977.pdf
    • http://kme-kme.cz/files/file/mejaxemibif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=discourse+on+the+origin+and+foundations+of+inequality
    • 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_off0000f095.bin
557bb57380f79ae45d2e34c01a32e68fff126d20dfd6a7ed18bc6cf6c12c73b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 11116 bytes
font_01_sfnt_off000109ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 16792 bytes
font_02_sfnt_off00012211.bin
c260f24d49965f4693592e7c3686c5866e94a530569ecb4b527554bad59c915b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 17968 bytes