Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ada25aa5305140…

MALICIOUS

PDF

83.6 KB Created: 2021-08-10 05:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5447edcb2f20f04f167b84cf27888982 SHA-1: 5f65b50bb748a7a69a4a36af0ab314c205b0abe4 SHA-256: 64ada25aa5305140a0070410ac81195adb788429355b1a3647a884d47c912219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fd945c73f3d5b69c721b8aab261302df/76003218943.pdf In PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/67638153362.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/95f7b9ef69c72d7fe35bd90d42934150/65212822118.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/kefuzegumameworelugar.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/bodafobelid.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b69d5c09ad9---22594860891.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb504f848---7214913114.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070b853ddfaf---29290086667.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/r348nei9ucqbab81nivfoh9na1/41814393359.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/24381642279.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/wibejidefeferumotumaso.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/gobuxov.pdfIn PDF document text
    • http://scpt.it/userfiles/files/xuxirusogimebox.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f89d060b21---29335548937.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/sirefotezoradutitivo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9d18f6df---zazugifemo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/12a14cf316f521e7080d648167ad5a5c/65699853315.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/lovofe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42f7e9341d---vosapu.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/fusinusifafavotul.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/91395496746.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/davogiselikipeluwo.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/56264433687.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/76076501064.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/kasozenorebewegebomofuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=where+to+watch+it+chapter+1PDF 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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10284 bytes
SHA-256: ea8fb1ee06ac13de7e37f983c5e435e14a1bf9dd2e3c3d2e7d954ba84789fb05
font_01_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 17860 bytes
SHA-256: 7459a51d1e1dec04f8f99ad066bb5022e5fbfa216342a5d346d5e55c2b42adf3