Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed224c3e6503756…

MALICIOUS

PDF

127.6 KB Created: 2021-06-24 22:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bdd794bfbed85cabe5809d3f1d841eaf SHA-1: 9756c33a089a2969d983a43cfab0f85b17a60156 SHA-256: aed224c3e6503756e00e03076a4cdd3722e4e7656ae01109f2eec8accd5443ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites and disposable domains, likely serving as a lure for users to download a secondary payload. The presence of a 'download' button heuristic further supports this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=saeco+vienna+digital+manual+pdf PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d5ce18571---seruxuxikaruwafiribejatut.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pabarinejime.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/cko47qsl0up5hk4n9to1t6tngr/26418540714.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2abb8a7d---31586057111.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077688d3da97---xubigip.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a3b40c7e---14350503224.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/23f0278c9689ea0366765cc23de0fe75/noragatu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8b7a8d69---69684560554.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9700a9df5ac9f4c15b55c131cbaa9f2d/1403342354.pdfIn PDF document text
    • http://poorclarescork.ie/images/dowagiletuwifozogejajezu.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/65395518991.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c2e0cffd---7720070451.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b151b32219---50050960484.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/90557313987.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/987c9168c477fe9f9c075bdfae173879/vanadezodunufijatowaj.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/89186486141.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d1875c1481df5ba107aaf814c822fed7/depewolemedatetewuran.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BF4 5364 bytes
SHA-256: 58fbfc1ccc5cde4726774e9bbf7fcd684260574cd67fc89f93d1551a8a2c17c7
font_01_sfnt_off00019e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E31 2148 bytes
SHA-256: ab398ce9d13cedf3d87490d21b6e4c88370e8362b600c2f02b97f970aedafcfd
font_02_sfnt_off0001a791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A791 17368 bytes
SHA-256: 696920a3ed91e08e690d2c5bd9efa8a006f7eba3cba0ca04e7b03017874cb241
font_03_sfnt_off0001d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9C2 16120 bytes
SHA-256: 6757b8e663b854dbbde5968f3544f34b042868cee9292bfa6805194535ca9ebc

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