Malicious PDF — malware analysis report

Static analysis result for SHA-256 61aa47e71ff1a33d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 08:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc16af2df1fbf883ab27b0f42a8d3728 SHA-1: 58ff6a7bc9a2219301582c0195a95c2c5878fdda SHA-256: 61aa47e71ff1a33d3ae17c09338a3814103772fefd567b84271c22248df83bd3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristics suggest the PDF acts as a link farm, potentially pointing to compromised websites or disposable hosting, and the ML classifier strongly flags it as malicious. The embedded JavaScript is likely used to facilitate the redirection or further exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=android+waze+folder PDF link annotation
    • https://office-agglo-larochelle.fr/userfiles/file/zisipuvajetabupilovoj.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/jitor.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/kovuvij.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/nobudusijujivaxirob.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/42137391223.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/ziwizalox.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6ccba038f8cc86aa9ff3072a49d8ecbc/lanovaruzapu.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/bevinero.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e57276c05---wirimowizonomaropunapele.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/forowip.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ec176aab---sagukejosabeminitino.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/rovijiburugomux.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/wexapuli.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/56200403692.pdfIn PDF document text
    • https://flomogroup.com/upload/files/redulefunadazatebewofu.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/29496109014.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/xatojafudugimalebewux.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/20605798659.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/57694364369.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/20489742536.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2e4bc36fafd45fa030e48130dbe4925e/60588693640.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109040701331193.pdfIn PDF document text
    • http://secretinvitation.net/images/files/90574154818.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_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 17472 bytes
SHA-256: 0e06bd673d0425da4fe1006f6154f3a711133dd290b90591798a151568733373
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 10208 bytes
SHA-256: d7d49f2fdfe0a3d9dbe56db5c6a51cd6c6cf7a18dd95056a16f8954a5354222a