Malicious PDF — malware analysis report

Static analysis result for SHA-256 300cd5fc85efd7f6…

MALICIOUS

PDF

85.5 KB Created: 2021-07-14 05:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ffea034fbdc7a0afd28f3d9e5fd7c32 SHA-1: f1afc50e8e1f554ef2f3a75f4244e9eb0c8306a1 SHA-256: 300cd5fc85efd7f65ad7f9e882f3489625f3428bbc5e55e3c03fb8b448ed372b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/piaa4ibj6ag3t18abqt9d8dvus/konunamebas.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4a514d2fe869f4dfb54b3558ee7e417e/97292012573.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b1164fce---bojuguzapupotilakuserit.pdf
    • http://massimosusto.eu/userfiles/files/50790866648.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mu1kriuvtkslce5hvmvkm0ee45/vowuxesowaroze.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f2bee714---84442571009.pdf
    • http://www.hangmandigital.com/files/file/4120586575.pdf
    • https://ntwbearing.com/UserFiles/File/59885704853.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9de462502---wubefarewovozukoruzu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/44610800db61296bc5c8b68b6759f78c/57219356039.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fb809naa61t6aa0nd45evlsa35/xusawemefigozuvof.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/71334883309.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fbe212311---favebupetuso.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5dfb5313---15623307956.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/23068234300.pdf
    • http://innotec-industrie.be/userfiles/file/29293047995.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dd9hr131im9ju59oqmvp1k4ih3/66693572370.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982b8aa7f73---86206374551.pdf
    • http://zatexpress.com//upload/userfiles/files/69627068018.pdf
    • http://bike-aholic.com/UserFiles/file/65817575676.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae683fbf066---teduwinumodomis.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02f04cad8---1042001480.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0vh4dlsmbghjss2svtdfdm5jcf/vomuxumugotanolaj.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/tolopu.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5dac97e5---beraromoserapu.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7j3cmhhtrvka6jed6tu68eehe0/92615521992.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+web+servers+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_off0000eb44.bin
e378a72b1bfba9d1cc9a2d3e76ab71bbb6a3c97365af4d764467101bbaee1070
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 10748 bytes
font_01_sfnt_off000103f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 16792 bytes
font_02_sfnt_off00011c08.bin
7dfb2c23563c245450256cb8445f12782f9f227fa2ee4db6ed38e6fc4f284432
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 17100 bytes