Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf680f55121961c…

MALICIOUS

PDF

95.7 KB Created: 2021-09-11 17:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d5b8193c1291862fbd45b878f28b581 SHA-1: 9359f4e7bfd231f7f6c2110203d79696772a7f91 SHA-256: fbf680f55121961c6194e05876e74692638c344e80b35332e3e125d86621aae2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many with 'utm_term' parameters, suggests an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=mejores+juegos+para+android+de+aventura PDF link annotation
    • http://jujucuisine.com/userfiles/file/xinosetirusexusevog.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wugagoduza.pdfIn PDF document text
    • http://apart1day.ru/file/8043874604.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/zetetalinaxadajowilenej.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4720eb16---puzojapobazivumusakizare.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/bubunajawawupubomojenag.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/maxugevogu.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/kuvubaxefutilebuwizemol.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0ad771db---95068351064.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/bilazubanixisonumorop.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/labamejiwavexijuxo.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/rudexelijamow.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/sivotuzewubopijagowo.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/molerod.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/fubewuwulotapakezibibum.pdfIn PDF document text
    • https://mackbeks.com/files/file/gegidanidogijexukubomafu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135460f833c4---98551691139.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/nemixuguritudoge.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/51576377654.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gonalojurizi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e01af22ca---27220430512.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/37377176648.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/buxalonamarexejisutore.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/64876121442.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/66099314879.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/61100969383.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_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 19784 bytes
SHA-256: 2b654e104c5a48a4ba9f57a2332e02ab964b0018c19c25247ac2743a11ccc827
font_01_sfnt_off00013fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E4 10808 bytes
SHA-256: 69b1d006f06a1c4f0f543ddbabd019d83331e825256babf2bd3665e20a9ca3fb

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