Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ca840a70ea85c8…

MALICIOUS

PDF

97.7 KB Created: 2021-06-29 01:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 964b37a5cc3af006e819fafaa5c2844a SHA-1: 87efd7a1f645d4538612496b244c82be00c2acd6 SHA-256: 40ca840a70ea85c8a6e164b61b1be907aecc94196ff6090d20429254c677866d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to lure users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fdc0322d---50418074582.pdf
    • http://md-servicios.com/userfiles/file/nuwod.pdf
    • http://sosnovgeo.ru/userfiles/file/90157334464.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aee40d6a4---sarokeneweragapat.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/n0b4522r3m0e7ei8cc6ugj7rkb/taditu.pdf
    • http://em-mould.com/ckfinder/userfiles/files/73639041793.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0cj4b7b9h1838h35rb7eh6r8t3/dobevurexexazilegutusir.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0fa9f094c8135eb2d4369ec663778b14/buzosobetazafimumikokute.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf7ba9453---21516970246.pdf
    • http://akssert.com/userfiles/files/10402212716.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d46bd020---vumupawiwusin.pdf
    • http://archerelectricsupply.com/userfiles/file/zifidusuzidofadepigut.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f8eca170---64426330052.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1975822eff---rujugixixawosowodafo.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/grnk4luqadneql6pmlm3i9thfj/bewevizuguw.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607678b3c4d47---18887519012.pdf
    • http://aaaexpressac.com/userfiles/file/91253366064.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/2980586508.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c6e3749f---23483468731.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9fe0e2a6e601a3074afb03cdcf5fbd5/winokuxuwi.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/rimerirugozad.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/efdqu3a6rv7p3gkljfo577gt27/nilile.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=essentials+of+business+law+and+the+legal+environment+13th+edition+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 16792 bytes
font_01_sfnt_off00012fac.bin
9bf4bd8ef09f1a9e57f00bc1d573178ca17c9b0b8b60735d02038a6fc9722d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 11544 bytes
font_02_sfnt_off00014a90.bin
481b15297c4a8664825b35032b200b06f7d63067aa9ce32f3db577f46ec1b99a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A90 17508 bytes