Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6b5d2e9b6aee17…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 01:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 63d7a4497b52b8f133796207daf56360 SHA-1: 532018c76a429253f733059a7016b020f1953b67 SHA-256: 9d6b5d2e9b6aee174dde9ac2341b6502f1b3b1d9fc8f58aa38887134f1a0e985
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of compromised CMS upload links further supports a malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=harry+potter+order+of+the+phoenix+watch+online PDF link annotation
    • http://exosportsante.fr/ckfinder/userfiles/files/lujeboka.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/sidogotopoxavabul.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7bc8927ac42cdd248285fa986e2e2dcc/dinebalumuj.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/77293854284.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d2b6dd7596efb5313c5cfa26ec138c6d/33029543667.pdfIn PDF document text
    • http://intersonik.eu/upload/files/57928253906.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/58939572118.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/magogaxakon.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/pifegubebuxadabokoj.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kibefujopusujov.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/657b2611638abff8a7607752c401ed8b/10098449315.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/wogirukatorinanowipoki.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98082032439.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/pewavarej.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/1239162174.pdfIn PDF document text
    • https://matratva.in/userfiles/file/wudovuxosazojid.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/9131079559.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/galoferewa.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161450ed0c9706---41341680620.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/46485396406.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7450bd35---molax.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416da10bdff---86819705520.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/95192603890.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/57998048044.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/femiwalejolafaw.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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 10840 bytes
SHA-256: 4754809f56fec9e1e3b1381294b6d0a3ba65a865312b7ca8207bec62db4bee3f
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 17876 bytes
SHA-256: eac22358f4f7fea7ac21f356b31a2a3d0a5805bbf4fd12e6cb3d8376b13c8fca