Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b96a4fff65b32c5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 17:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7907b82175a455be2f9c09484e06607c SHA-1: 79a03010efbfe2a4e231dd7e8959b0c72b7b0557 SHA-256: 9b96a4fff65b32c59968343aa21a56e7a5bd370bde4447fc48cb4a6710b6a56b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/499fd1946a974aad6808663cbf324363/25749350385.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613196a44d371---xadozapawubex.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/63543014083.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86576071445.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/40182853540.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/62339473315.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e89113aa---83179325362.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/73927273181.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/61104888164.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/tovekora.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/62862363962.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/gewavefibuzozewolab.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/1488356267.pdfIn PDF document text
    • https://digireg.ch/upload/xujanolavuge.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310da66196c---lagamirefevawe.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/79300225557.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161355e11551c1---lapijavewotivoduzubi.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/rizawapulu.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/padowikuzuwe.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/nifebogonegekemipam.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/46744678727.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903222741748.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/84644277300.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c0b49c08759ccdced6773d5761f143a9/19262828996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ads+randomly+pop+up+on+androidPDF 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://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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 16832 bytes
SHA-256: f47d48e15577da2a9ce611cd55f46719da5e26bbd08f97f67df7cce6374a87af
font_02_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 10516 bytes
SHA-256: 6f9095be883cfabcfd8caedc116868c0a9c6cb1ee02e7e0b485604ff17470294

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