Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ea8a349ff85e60…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 01:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 608607285c53d2f2cc79a49fb2f80bad SHA-1: d8ef5cd1a2c216ce4bad376b5f76a219bea0d13d SHA-256: d4ea8a349ff85e602b710409dd8f07831232097ae66861ac3343da1a63b4ae54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

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 https://dienlanhbachkhoa.info/upload/files/luwomepuxidibux.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210626020357.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ab04cb90---86782392690.pdf
    • http://mea-travel.pl/userfiles/file/fobulutagaperozo.pdf
    • https://amblamy.ee/upload/file/57089727342.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcn20h2otn0at8s33lu35rlr57/22169421443.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df900e53---55884442599.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/25252434158.pdf
    • https://rybczewice.pl/userfiles/file/36214518893.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1909adbc---zabonojuferagemimepuw.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7d306a864ad5434dd8561c67d4d66990/famusenanedumugotak.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bf31ca63f55743f1de78dfa0f5aa8a22/xaritupisizebibivajoporo.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a7cc12bb7cb5c53387f8dd19f120fddb/zojopavogo.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f9630977---lobejunosovobafep.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/b8gf3ihe1iueasl9eun3cdovk0/73009683477.pdf
    • https://salvatoredivilio.it/userfiles/file/16824211765.pdf
    • http://www.lugashotel.com/data/editorfile/kemepexikedefof.pdf
    • http://nadiadsa.org/userfiles/file/rufaboromulupir.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7d18f3fff54030c3b2d2d162820cf9a4/nupinolixabofi.pdf
    • https://alshaabcoop.com/userfiles/file/fowoxuzolas.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59151e152---zawukeli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+color+do+you+get+when+mix+blue+and+yellow
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1bf1c2679ce87490dc61af67aee0d3d3/1375110020.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_off0000e891.bin
7339c7c7f08a656054befc384640d72ad94668060bafd19576fdbcfff2127d31
pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 16552 bytes
font_01_sfnt_off00011394.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 16792 bytes
font_02_sfnt_off00012bab.bin
ebdb960cc9a92c4fde57acd828ea6addbf868becff5bcf1500ceba4378cd97f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 11184 bytes