Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dc0d1cdf04797c…

MALICIOUS

PDF

110.2 KB Created: 2021-06-28 16:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 88b6bf75bec0469f94ab7c31fec52b07 SHA-1: 7d7e4d8d9807eafee798003ef9e7cb8ad2536b85 SHA-256: 24dc0d1cdf04797c283f921a6de7635162c3f12844950b5e79d23818c326b71b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which are WordPress installations hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the nature of the link farm suggests it's designed to lure users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sinhadventure.com/uploads/file/nedoz.pdf In PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/61362460391.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/siwilabonuwovotopixazoxo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/91bc055d31d2ad15086923fc468af6a2/54874164632.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07b293edb---6147363939.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced10b2fe3---48787660600.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/75226758822.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/waxitubavu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e5fcc402---83534763066.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/48661566906.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/finumixunalebobideki.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0109f7b5f3---bijewufepovanusukopuxosev.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rmsppbusgpn8mu38lb3mhp3gr1/26443726350.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/59d7714542fb681a1427cdcaa87328e9/vezataputebagixav.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/tusoxo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/120fc02311e4f30be5646c09ef5a768d/jagisozagololubewuxirike.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8018f165---samemosuzokevoxobuwe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3df99a4557a057cf966291163795ca78/wejotarejiweluzod.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f63a824b---kejeluzolowatomazewewa.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/mupogusalefuzidil.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/kaliledubidajetifebo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tagafubigidum.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b268633a2---19349281732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=systematic+cluster+samplingPDF 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_off00014d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2E 10884 bytes
SHA-256: 8cb89ece8dcc5cb4be67a73149c2748f834acb68b45afc38e8efd41dc83221a9
font_01_sfnt_off0001665c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665C 17352 bytes
SHA-256: 465d2cfd43ad28fd75618e8421adfc45fe2aeddbe8a2a10e5fbe9286197e97b9
font_02_sfnt_off000193de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1