Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dce7b410f67f986…

MALICIOUS

PDF

86.1 KB Created: 2021-08-18 04:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd1e112bc8ceb2773e505abc9ffca57b SHA-1: a1d850165dc0d6e8db12f1dee94377ce37a66b19 SHA-256: 5dce7b410f67f9869873e924ce86e557d389eb1ade073fd7fd8ab989b61a23ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=partituras+de+coros+cristianos+pdf PDF link annotation
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0388f2c81---namudofexi.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/8957800982.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kujufofowazifo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160926a22422ba---morufidexotalovemewewi.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/nofaxala.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8995c18d---jusokuwawu.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/46494311575.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1588b2d6f---makopixetilov.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/lavovejadaze.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e138962b24---kefakeb.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160832c5b6706f---derurujasilek.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/gifetegoxake.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a0bff445943f0481dd841d2befa02cc3/lifikanoxexowojel.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/82397780486.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210514081432.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///fidirunakazibedotuzomowu.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/kupezabofavijar.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/jusupeguxow.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/pesopufefuloneto.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521cc7a904---57320001568.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kunadezoxobanonobapibu.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/simivuxitifefi.pdfIn PDF document text
    • https://migger.dk/userimages/file/kexilamutiwamifixisu.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/jexidekonuwekope.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/15179005813.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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 10668 bytes
SHA-256: 0e6674117123eb604617288946ab1813150ac8c8ffd1bb7fd31db2c59aaf0018
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 18928 bytes
SHA-256: cade93b01f17081f82428ab8b5680306e3a4b24dd70a9f984492ed36a1e9624b

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