Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd8419c3afa0553…

MALICIOUS

PDF

90.3 KB Created: 2021-09-19 18:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd7d2828c1d3a19632b32dcbbb1a8489 SHA-1: 700f9c896a23c2d3753fac65e6833f848f190170 SHA-256: 7fd8419c3afa0553b9adde2b1eb2cc27d09477c7cd4258ae8f2c9651ec541c83
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, suggests a phishing or malware distribution campaign. The document's structure and embedded URLs point towards a social engineering attack aiming to compromise user credentials or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=where+can+i+watch+96+movie PDF link annotation
    • http://ettorebelfioreliutaio.it/userfiles/files/22311098674.pdfIn PDF document text
    • http://ativn.com/upload/file/68504721979.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109191955514028.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/bufunuwefuxanuwu.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/rufowirejanowofebuvuwut.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/87236974135.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/45277684199.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/retokijusarazu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140803c83aaf---71780784900.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/de0cd74be8207cf7efee5228d8a5fa9d/lemowogifile.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/67929671439.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/58568123388.pdfIn PDF document text
    • http://cl-pub.com/files/files/jesit.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/44498898518.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/pufojujiwerogakukipomu.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/34466114498.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/pesixosatupajulifivib.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/72749989831.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/96755235328.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/51264370802.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/penivolobageviriwosa.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/72861161241.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/24734699545.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161466961dedd5---suvesi.pdfIn PDF document text
    • http://merwepizza.com/upload/file/61713333222.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/51032534114.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/67955399113.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_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 17596 bytes
SHA-256: 1faaf6427105e0c4f0d15e66e9d5b59f4016d440cca3ba938f69f1a4344f845e
font_01_sfnt_off00012a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001427f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427F 10760 bytes
SHA-256: 901f9018644c8b6508fda08c0de8f27c97413eeb79ff22488dd588518a6b5922

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