Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0343f88cd2e5af…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 22:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd202f961797fe6a7273de54df9fca05 SHA-1: b7641b9c57a25a39329edd4cd355aa1f42d36bf1 SHA-256: ae0343f88cd2e5af3ac52c7f75ae35d78865c6d6a9d2700184c33e7f5e11e6c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories and disposable hosting. The embedded URLs suggest an attempt to direct users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://deltarealestate-eg.com/userfiles/file/samonutumitetugogofovasej.pdf In PDF document text
    • http://eot.mn/uploads/userfiles/files/leseredotofajuk.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/wifixawikuka.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/23633881610.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/45873607842.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/zonuxuwudezepuzununodu.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/19027806222.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_101220.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/65307378633.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/74261700106.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/galab.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/85234350648.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/66395478424.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/42200410335.pdfIn PDF document text
    • https://raljob.com/userfiles/file/dowobibumifuguvu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc3eaac9d0---pabokavabumukokejusarabes.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161395163420f3---taruzikowazusaturodiwuf.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/97665495251.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b980f1091a6050b60d386be7f0fdcd86/nevutep.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/62952415739.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a677a307ec---mikemojuwi.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/21687905003.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/005f3e6adab0e4d134f32bb97428e4da/wofebisibiwisebososatexov.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109082048389946.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/18337111352.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/38124229689.pdfIn PDF document text
    • https://thietbigas.net/media/files/97814580077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=virtual+rabbids+the+big+plan+apkPDF 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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 17264 bytes
SHA-256: 882579eba0a30caf686903e7b52657f0166a8b8b6fbe7c69d4609155ad294e53
font_02_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 10852 bytes
SHA-256: 405c7e99218341752712e2fd954a89997f2dad7a80ca943e9504cdb9932dea98