Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad33dec49e21630c…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 01:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e0cfe405d01fe8bb476764ecd6281a8 SHA-1: 211a99c5720024afd9ebbba9e476ca83c55c7ff4 SHA-256: ad33dec49e21630cf528bb7971d9a2441559affefe2fe4abf2d1250eb2792db8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phish users. The presence of embedded URLs and the nature of the heuristics suggest it is intended to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0a026ec163437a399d88a10827b88b46/nixulevisokogamunomovemus.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061004504025.pdfIn PDF document text
    • https://asiabiru.com/contents//files/dujizakubamuvinizeguxot.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076929be155c---897607427.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///56323778470.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/cb88b9aa6ac2a1415af3e3d0696a8406/73032064063.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f49a3610---99980873439.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/160816325624.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/witos.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ab625fc0c66904cbe434c560cccd5dc/tusiwajuzejar.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/karoluxofovana.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/lupenelimarubuvuzoten.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c011f8a5e4a---jerojijitumumu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e6d4f0270---jisewegelekezolifufixu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b302c809cc1---71141722463.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a25951bf1---lakujaluverikapu.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/ziledurinusijawezal.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c38c3c0007a---95513295019.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/93173966508.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/72195806317.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/gijezitudidogilemumidux.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c9ceb2207b65cb736b587d03d89a118e/81874999061.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/41e5f46c096175285b9be454deb320c3/85990777124.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607563348e8ab---lilefaxowaxobodusivon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=marie+curie+individual+fellowship+2020PDF 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_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 18120 bytes
SHA-256: a5a2c1912f51f698233ce862be45af7776cd96ad818f18b3b37e7cb2f3ac9f79
font_02_sfnt_off00013e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E87 11104 bytes
SHA-256: abc3e15e9d5c117154a9db17212b78aaf29093e8bf45e82afd5dae2cb00dbe6a

Open this report in the interactive analyzer, or submit your own file for analysis.