Malicious PDF — malware analysis report

Static analysis result for SHA-256 0188193c4ede984f…

MALICIOUS

PDF

90.4 KB Created: 2021-09-15 10:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7571e7e3ea21aed86054355d1fb5b86f SHA-1: 0fa2a01618d4438f9238e105b7f714054db3acac SHA-256: 0188193c4ede984f4d57425898dd8dcf3fd004f15fad3ac774ff6f1c776c1603
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, indicating an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72656001809.pdf In PDF document text
    • http://dooroc.com/tk/upload/file/birum.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/46aea3b4f294da4a8b4d08b085bba59f/28446672402.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08dbc9c7d---katenokokonudemapazut.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/rokusomugozimopagunama.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/34710820490.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/luzimowewisaxegeje.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/wigapuravoviva.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/kawaza.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/70045085346.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/83246610831.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/98749746313.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b759973f4d8897bbdaabc79063487159/50410252895.pdfIn PDF document text
    • http://ijfbn.com/editor_up/korika.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/44679744655.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/vivuvikagebasi.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/bumedenawera.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/zevutiluwalurinab.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kovexudakalexage.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131403c28017---53986326102.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/10216502015.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/73629643974.pdfIn PDF document text
    • http://watch62.ru/files/files/16663369529.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631321903miletizoluzup.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/vofaxopexapexenal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sad+depression+quotes+that+make+you+cryPDF link annotation
    • 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_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11260 bytes
SHA-256: 730e3b34ebeef88677b720d1c8d368f57a6b31fc433e79c1d396f64a92699e9a
font_01_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 18132 bytes
SHA-256: a82eedf79fc5c5c7435b6fce8772addd121250905b8563811fcbd5c222150a38
font_02_sfnt_off00014355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1