Malicious PDF — malware analysis report

Static analysis result for SHA-256 692791c7d8503526…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 16:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21c2cdb45c81b68e76a52897732cc096 SHA-1: faae43e756f6f697457e1d520eab81932b2b48b2 SHA-256: 692791c7d8503526747bf580a7dd07f960ba37e714e1806bd8480d439e8795ab
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/e3eo0s6doco3obe95qfqtd2v4e/28846816820.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160815b22ce59d---79323408637.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ac765bbd---duniduxinivu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3382641d---67604538543.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fbe91c38---vakagunapagolusawe.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0eb83f546---mepedus.pdfIn PDF document text
    • https://hirurgija.me//files/memuwumejakuz.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608543c8b2c0e---63296920441.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a24476f3---jajudavu.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/24270544526.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/topaja.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/59069328034.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5d9c368a22675a93a23b91957c7c8cb1/midixotanim.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/15567191481.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vapoxeroxini.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fabivana.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/sejezonatuzipitijejir.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/18934518908.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a53b3202---nexubatadezeveke.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753b639dcd8---4862167252.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tajowaduxemezok.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e52b614f5---xatit.pdfIn PDF document text
    • https://baongochoa.com/upload/file/veweroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=low+liquidity+meaningPDF 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_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 10724 bytes
SHA-256: a5d34e61ced23bcd9ad3a13ced0e416013fc754c9fcff41503e5a43b82b0a873
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 17012 bytes
SHA-256: d4a625a83dcfeb8ad1491af02a59f889b7bf9024c6959d5c51ea3fc5a061c625

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