Malicious PDF — malware analysis report

Static analysis result for SHA-256 12de1804be9d9741…

MALICIOUS

PDF

82.8 KB Created: 2021-08-31 19:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8173d62f999b149123c9f39e41b3a8c8 SHA-1: e11cc577e0908c49dfc01020bb2151a99b6c23b2 SHA-256: 12de1804be9d9741a134f5d39053e699f3e9a7ac5f7d2f1f114743781fd0496a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://detector-billetes.com/Imagenes/file/6371954309.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb257863c---libosirabefagadunedawewa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63b2740cd---72852953188.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae61cde0d0---66256441423.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/kiworefaraw.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/37032836860.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f84000ef7---pebomejusi.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/mukawimuja.pdfIn PDF document text
    • https://senhewood.com/d/files/nifudotebe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2086b9fc1d2adecd218cff6b2ec76add/90677212798.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078904437bb9---53167848736.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/viwopuwul.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/53846453103.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/xexulisipexaketolure.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db881301d0c---gizeribike.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/77915192294.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/fokedimesizofa.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c694006db5---29806789543.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/33040141550.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/losivo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/65a4ca9c30e61672f871307b7d286f0a/33240798411.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/jaxoturirobudigiz.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/11720503062.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/jinewekumusuwasepe.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2596d2a09a2c38b2c0d1d6345afd3334/daxonokuwixew.pdfIn PDF document text
    • http://videocycling.info/files/file/suketosatedaluxagiju.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7851258f00---fimafigepolowerovupix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+cradle+of+the+hockey+club+free+pdf+downloadPDF link annotation
    • 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 10952 bytes
SHA-256: 74fbbd31a2845aaf53b17d5ed4a0dabe7217f1b5b2ff3397b156cae454e2bfc4
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 19176 bytes
SHA-256: 49e9e4add49acec4dff7c6438fb76ea2fa531209d553aca7c6b139bc04af92ae
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1