Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0cca3aef2ff4ab…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 14:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7b72210a8881d47568b8a11c27ee40c SHA-1: d3d9ee62c4a0f5a1fcb60d125db93afe36f15759 SHA-256: ca0cca3aef2ff4ab65405fcc183d8b2350b28c800f4db92af4d72f92f13affe1
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of numerous links to PDF files on potentially untrusted or compromised sites suggests a lure for users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 http://gpszone.hu/upload/userfiles/file/tomirugu.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f17a09f184---8544183499.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/tesajediwolelexo.pdfIn PDF document text
    • http://mp-journal.com/media/file/jitolizufe.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/95559759890.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615034a89b8f8---jijano.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/61948620637.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/kapoxawoxu.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/29109436658.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/18549117415.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vogegubokibiro.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/finutuvefodojazoxode.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/wuduzagaxobenus.pdfIn PDF document text
    • http://linza-market.ru/upload/files/nolomabes.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/nudirurun.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/xeneviwudusufat.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cb368461---mujasozogidiwotoxosuju.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/3567168145.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131015feba9a---wububabusu.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/90074018393.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161300074cbf1f---petefamekuto.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/salapemonefivur.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/44387147574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+tv+chrome+apk+downloadPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/vaxatawefisuliremobowomil.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_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 14732 bytes
SHA-256: 220f39ab66355c3f56a83b6dd9dbcfad42efa920367b4265fb84abba65bbe99c
font_01_sfnt_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 10836 bytes
SHA-256: fac560f2854057a7199f4c0ca5bc286ae5a335748b17107120bae8fd74fa7c06