Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b797f686485077…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 23:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a96b6c717fbeb49d19072dfa4d2e02f SHA-1: 376e0fb038bed360e6eaa015b34cb896dfd6f2ed SHA-256: f7b797f686485077e8d57f6cc7cb966d4553713e2d0d10965003eda19cfe9691
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608673862f2ca---80701898914.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16075b159a95df---7926729352.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/mabarixaziw.pdf
    • http://autodilykanka.cz/cmsimple/images/file/xewujifemegoderiz.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2be41a95ea97398db4603650c0b79eb7/sexapovasofujuxipojepemit.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f91c7117---jonike.pdf
    • http://asustainable.com/global/file/buxodabulefasekiravenenak.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/48043120966.pdf
    • http://asckhn.com/acskhn/userfiles/file/98616098420.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9916ce23---gevaduxoperomu.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b17adfe7e52---62199838589.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b088c395a5---81249573491.pdf
    • http://vyveva.eu/UserFiles/File/47392264818.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/doxomitamaxoreloxarok.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/fd16706a19530b3381888a7d49fd42e5/tumevuxema.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d2c4a61d02dd39996d132db0f7d4a63b/37393053938.pdf
    • http://timebymtm.com/upload/files/jetupamukasewon.pdf
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/liviganeroradelubixev.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160989a6727a8f---lififusesinomopudejana.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972399cbac5---bezilepapajenevadi.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/122addf21208b216501aa05ec0246827/65153356283.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b96a480317e---dimowexobivakinevokapeba.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083233f1fbcf---divexodolaweliza.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+say+vagina+in+spanish
    • 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_off0000ebe0.bin
41b1a67ea294405c57bde34e88e14f3dff4b46e5a3a1fbd2d43a3aa650ca9052
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 10508 bytes
font_01_sfnt_off000103c3.bin
b6feeeb46bf7f609804334ccd1f10052118595b82401fe69ab66e16d065ec1c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 18880 bytes
font_02_sfnt_off000133f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 16792 bytes