Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f52d6a651c81acd…

MALICIOUS

PDF

78.2 KB Created: 2021-06-30 15:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0692ef03fffbc7b2bbc957f2ab3611ee SHA-1: 91a640c0d8efd358d8f8c4aa417b6612557cee98 SHA-256: 8f52d6a651c81acdc78b1b71016085f5f89687e6aeeb8e18c1431a4cc0f7c4ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketchas.ru/uplcv?utm_term=gould%27s+pathophysiology+for+the+health+professions+5e+free+pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4adba55c73088afc2c39ac2ef18daa47/37795899631.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/h9u8hf5jk6e0p40lhfn8hu3g81/89724110764.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j8l2i1figcib02sb7cj6l04jof/sevaxadipepujo.pdf
    • http://dekoblickfang.de/userfiles/file/jumotefipozet.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/aeb9c1575c42c7daba83ac1b831b421d/jexisipuzes.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/tukameranu.pdf
    • http://vuason.vn/upload/files/7475011405.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fe40f707301b8bc59e82960688d5135f/67004416679.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8vjg6n6u4dm36j9tk5b0gscake/tulalafimazaridoramifaj.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/df12ace71b07a06f8284c5e08d564c3d/jezulexuxomilakabem.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/32308419022.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e41fc54fa0---19474622162.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e7305f3f---88157482760.pdf
    • https://alnahamgroup.com/userfiles/file/46273648026.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a9c466fc2ff4ce5e24379297f946610e/jogonuzukapus.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bd553984c85d8e347d6e507b05d76184/57932212390.pdf
    • http://hb1004.com/userData/board/file/71241809863.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n0ikmumltlpussrgd6hu9t03q1/99867022083.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c24d05a1---74000197206.pdf
    • http://icltindia.in/userfiles/file/83259271493.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2fq9sqch713amkpiclv9rgl6s0/vemotobozamujopu.pdf
    • https://raiporjai.com/piceditor/file/bogewogulawobilibakanuwam.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/37201895200.pdf
    • 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_off0000c927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 16792 bytes
font_01_sfnt_off0000e139.bin
8fcd1752ec539480c6707d20dbc9076bb070d294f0a21aee51e749286826d6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 17596 bytes
font_02_sfnt_off00010ee4.bin
9983aad853ef3e3a92dff123dffff276300cd50f448f36d3fb9d2d8df451bba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 11196 bytes