Malicious PDF — malware analysis report

Static analysis result for SHA-256 9549d460652e3834…

MALICIOUS

PDF

90.5 KB Created: 2021-09-12 06:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af138536bf490ebaebcf358fb98c3d5a SHA-1: e72458c58e6d1552c3ad10b4258feeb4b4dff2d5 SHA-256: 9549d460652e3834312dee5531b2c7d7cc155e3564a85e051e61e0c259b3f142
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. The use of compromised CMS uploads and link farms points to an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=movies+that+make+you+feel+good PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b2148d25---19759340612.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/60765209639.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/fukifinuvemupuxu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613839ffae282---65225021919.pdfIn PDF document text
    • http://webursitet.org/Files/file/98142243557.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/riwetedapev.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/dositewujimafabuwoke.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/67243191857.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1d4e0ad4---rosis.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/73210781972.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gukazobogozulumofun.pdfIn PDF document text
    • http://shahgrp.com/uploads/mavevuwokonudodig.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/13472527455.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/jigamokojikovajixofomelu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/56454011038.pdfIn PDF document text
    • http://goldmustang.ru/files/files/bojolexeg.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/58153821313.pdfIn PDF document text
    • https://blugarden.eu/file/14192623522.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/86064827089.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d89df81a---76268886355.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zaniwovebukujevux.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_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 17228 bytes
SHA-256: 556e8c59555ab579690a9cd24cebf509f0cee142419d965378b930bb62a023fc
font_02_sfnt_off0001439d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439D 10960 bytes
SHA-256: 81e4e520b3ca9be660a261c4fc00bdc9f1ba461d84945666c37545a289e3a9e4

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