Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90762fcff969a0a…

MALICIOUS

PDF

102.1 KB Created: 2021-08-13 05:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9353fc024b6960b5d590aa60f9b2e1d0 SHA-1: 5d7269a337dd2699cffc1d6653279116124e1ebd SHA-256: d90762fcff969a0a8a0aee3f125161107f08f439d9f25d29ac4769dda48b7193
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 6

  • 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 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=argument+essay+example+college+board PDF link annotation
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/88942312954.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/japabixowapawefanalujes.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/23956195486.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a91d83228c8068827c16e61dbe558e7d/35197599332.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/kowirob.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bj2opsfs5s821sneclhtu99r2/43684851783.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/85014719267.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0455fe502a---galebanozuben.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/9cce969e48bfe1f72ee6e26eb71f9a68/15871467022.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/geravokekuruwenivese.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/41397675184.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9d6a7a12160b96beab2d1d2654470d45/fumafip.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/76e9ed6f25761290f4d0577b516d142f/jakiguvovidusemoneped.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/57801692419.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/33387572202.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/zozuwes.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/32310384162.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7c0bbe55---tuviwugozinebedovefalitos.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a4c80c197c5a3944347be2146e41e96/53654017220.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c270a1239---27517827517.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b2htcdk0i40jsl0otrtntbnml0/dinezazeg.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ede59801---61325771810.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/64511192414.pdfIn PDF document text
    • http://0930actress.com/files/files/18111814620.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/67693240068.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/83670205868.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d8906e560---fudoroz.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_off00012a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 11204 bytes
SHA-256: ef7079cc4200c834c5fc6741a2dfcf278f07094c26f33ba9a1e2296ac1a324c2
font_01_sfnt_off0001446c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446C 17496 bytes
SHA-256: 2037e2d9b2bafaa0aed0c726584afff9eb3a56020abc5278343973647046d998
font_02_sfnt_off00017258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1