Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5632827d6bd7489…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 17:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 258a6ec70ba110cc2affb82989a72755 SHA-1: e7dbbcbae96140a6e0e9447509b116c16b51a85a SHA-256: a5632827d6bd74895bc92ec957fbbfa84749b581ad075fd3bbf7595ff4a6434f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple potentially compromised WordPress sites, suggesting a lure to download a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document provides password instructions for an archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of PDF links and the overall structure suggest potential for embedded JavaScript to facilitate the download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/dd9cbff1a7bd6436f62fc03ee0acb0f1/52855434417.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1h02shbhb2lf9ueeebvreiebob/vodazidiwukibevakakabeje.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/maxasaletipopojelirazuv.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/l2bj2p4ahu4d2o7ree1g4kmiv8/90571752985.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5fe1b52407b385ea91f368166d3e7fc/3007465037.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e60eee605---33655259472.pdf
    • https://aduanaldelvalle.com/userfiles/file/rubejo.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a9e9219d2bad86b6199768efd7a2f735/juvaleditijodikalur.pdf
    • http://xlsferrosilicon.com/d/files/goronumafadedo.pdf
    • http://analogsys.com/uploaded/file/1121410188609ce5345a576.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hkrjg3dig2dg074qik9hmj1bkh/ruludejigokalewakadu.pdf
    • http://czdashan.cn/uploadfile/file/2021050823124673499.pdf
    • http://thetestmag.com/userfiles/files/diwumupawimuxewuraloro.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/93920093428.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6434593aa17527cbc2708edb48a4f703/69781816130.pdf
    • http://unityproductions.com/upload/files/koreveroba.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/xowubisaxazogifo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a4936a2b---50486449608.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fd1ab2ff112242638305e4adfa66fdf6/jepofoj.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2fa68aeb5---19837608988.pdf
    • https://mamo-tato.ro/userfiles/file/mimime.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=confluence+recover+permissions
    • 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_off0000e9fa.bin
c18bfeae0306b59a4a770e0cf9cea453c36d8818540af8382fefb6abcc9bf54b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 10580 bytes
font_01_sfnt_off00010224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 16792 bytes
font_02_sfnt_off00011a36.bin
a6f06602b09ec0d2e59e32e9c86ee62a1c0d2bbe2979fe1fe793b73cda65b6d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 17504 bytes