Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fb4dd6ae88599e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 07:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a82bc1f0b695f069c4271edd400afd6 SHA-1: 84db6eda5ed018f00ed33288745e69b5f911a1af SHA-256: 96fb4dd6ae88599e6d49516a50f7ccc37a1987b8808912d7473757936961c37b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=escape+room+2019+online+free', suggest a phishing or scam lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=escape+room+2019+online+free PDF link annotation
    • http://m-s-g.ru/userfiles/files/85954290041.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/40797868531.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/73454477636.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/70156378215.pdfIn PDF document text
    • http://gardatrans.com/content/Files/pizizajejesobexu.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/62406424586.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/78188180579.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/42309341048.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/rufanipevobovenub.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca80f3eb0---96338405351.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28052728554.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/guvetigetuvuliwifenibo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6bd918e5---nazuvuwubivisavare.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614269b07bffa---30295008307.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/nenegevusodu.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/xiraxuw.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/sesiresewesupagololexufu.pdfIn PDF document text
    • http://epmachine.ru/d/files/luwanogajulimevuxatewat.pdfIn PDF document text
    • http://jainfarms.com/uploads/rabodakezozuxovuzivodesal.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/joxivanewubinax.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lumejiz.pdfIn PDF document text
    • https://tessuno.com/upload/files/613e477d0f7b8.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/40479741935.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/nuvusozigamixitotafat.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/nuvadeka.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_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 18640 bytes
SHA-256: 4b29cc1d771bb59cd23b25f2e67d44d44d2508730de4d9fef4a8a20b6165e27e
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 10988 bytes
SHA-256: 4807faa1d3fe46acc8318aa2a8acc09e822e8c70effcdccd2d07dd0c77d181f1

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