Malicious PDF — malware analysis report

Static analysis result for SHA-256 257dbb164e9fa07b…

MALICIOUS

PDF

79.3 KB Created: 2021-10-04 22:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad014828a9b3b9fcee8ad6b80b6ddc07 SHA-1: 95c61439bdc414ecd74befa6850adcf8b4fd9704 SHA-256: 257dbb164e9fa07bdd62bd5825e6f19679e87800a0354bac88f808386aa84454
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine rankings or redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=brainpop+acids+and+bases+worksheet+answers PDF link annotation
    • http://m3hotels.com/userfiles/file/68800046999.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/4689535034.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/84870775485.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/ravolovowagifasase.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e439f0389b---68151687682.pdfIn PDF document text
    • http://ccsl.asia/files/misubamok.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/83082178055.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/kivebuvolaxoput.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/26058401778.pdfIn PDF document text
    • https://vleek.com/uploads/files/57772993168.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/73672911329.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210912175009.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cac0eeb98---turededaz.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/mimonesidalegajuv.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/37174984381.pdfIn PDF document text
    • http://tencanpowder.com/d/files/xasomen.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109010248544796.pdfIn PDF document text
    • http://bdn10.cz/files/file/kutizogitorusenigub.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/mupidenu.pdfIn PDF document text
    • http://greenglobepms.com/uploads/somomezu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432a6197b84---22590184039.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615afa983f7af---91687133219.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/35455239234.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i16gir8uccej13dj80uolql58o/jofavawafimujapew.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/8353122213.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/retojememumujugazelemaxa.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/89842067665.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_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 18124 bytes
SHA-256: 4c42660280ce2f4e9c4d06c2db08cdcfe84c12826dac47800b192db0ce36e948
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 10936 bytes
SHA-256: ebc8bbb905b2321584abf804b69ffe3a55fac3a1345fa71fd64db3865f94d2b1

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