Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c892899a393d83…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 01:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5949b343f17e852bfa665057c4ebfc74 SHA-1: 214a0c4b05bc675e3dcf30a544be65e71c2752bd SHA-256: d1c892899a393d8368af03e72183f202532112b5ba5418d67f6ee0a4e5933ded
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=properties+of+equality+worksheet+geometry PDF link annotation
    • https://anmoul.com/userfiles/file/24760070280.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/53253090704.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bed990350---lofinejorupaser.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6cd945d3ebad55665950a0cc4a109059/lebagazi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6390ce46dc281df75ca2cb0eab7db4c3/dajiviwinewabikaperi.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/wavilurufutezuberule.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/30653263436.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/xinamizape.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/55388533543.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4221854981---pupilanezeje.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612d246be699b---zirizeni.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/58989747611.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/86573173b10aecb519ec822bed8a6483/lanewotezixa.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3074238481---tukika.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cj90653786jmqscimrcm3r20nc/derotate.pdfIn PDF document text
    • https://ive-cal.it/file/1635677118.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f236207a5---58518155574.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4gb3bbbihlgnds950rieq938r6/72367321758.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/25571206517.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87b722986---7043822308.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/75608358262.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 11240 bytes
SHA-256: e3a7dc2a7df26d911e2ce03f6373b258dae3bd6e514d75e69e0c7e5439052cea
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 18564 bytes
SHA-256: 7dfdc61edab97e30afbd6abbad0edf9c9bcdf67b9cabf2bbc91fb9752bccc90e