Malicious PDF — malware analysis report

Static analysis result for SHA-256 902fcce8a299f930…

MALICIOUS

PDF

80.4 KB Created: 2021-08-20 20:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfe6105f1e4e6a80fb68c5a65b795c6f SHA-1: af965391d5510d71048e9152fbc990188f845fae SHA-256: 902fcce8a299f930c938704a0db3226067598d4773b8553695dcf20246578251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=cursive+handwriting+practice+sheets+free+uk PDF link annotation
    • http://studiopedrazzini.eu/userfiles/files/zinunegagidonudezij.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/31625576919.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e412ee86---96488833782.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edeaaacedb---betapuv.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/tosazewonuzezumi.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/kerusavotizulenilo.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxidanowowijezevu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/9766154581.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6c47a7d4b---54464046807.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/zizagax.pdfIn PDF document text
    • https://allianztc.ro/files/file/60489539296.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/32171552998.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/97240372996.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ba20a11ee3cadc1f2ab0adb041357bbe/besedonogepito.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc26346230---85302166192.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/vujixapu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f564d11b9c---modadupa.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/67141946489.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/33868975494.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608461f66cec6---45966341659.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e382a111e3---wubuxinabi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/19f425c178fce97923be0dd26308340b/jazigogijafuzuxofo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520132231221708.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f4e7e33e---daxanas.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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 11108 bytes
SHA-256: 4e7577e2fa3e2fa225fea7b97e267a3ff68f04efff997fd7a9cbeccf5baf1fc5
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 16384 bytes
SHA-256: 12461daf637e540789e5a5986356babc21164806d4c770be08490062e9e593c7

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