Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b3272543d2240d…

MALICIOUS

PDF

84.9 KB Created: 2021-08-03 15:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed52ccfad81d77da09eb70f01b2525c2 SHA-1: 3755f1007505c1f3d898a5e83cf7d2ff36afe770 SHA-256: b6b3272543d2240d266be0f029f62ac4173dad00adc64b7050ae4980c9f2b478
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=piezas+para+vocho+en+guadalajara
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sekusunekujo.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca65a36fdf---vutawumimeji.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083976ba1998---gozubewikenoxizijuvir.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5c395da1---78827253753.pdf
    • http://zxpgw.com/userfiles/file/24836571795.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726c8ad2490---89072877097.pdf
    • https://chmelo.hu/sites/default/files/file/segisutemulevazoput.pdf
    • http://architettoangeli.it/userfiles/files/zetelopanekemum.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c944a3a69b---95469309572.pdf
    • https://delcinfo.ru/img/files/files/salom.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fa7593bc3---goxebakurisa.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811fd614c6f---bizudolubibekodovow.pdf
    • http://yaqeen-eg.com/userfiles/file/85268186212.pdf
    • http://fautographie.org/images/userfiles/files/kezikebuzozez.pdf
    • https://familienbilstrup.dk/userfiles/file/74435759093.pdf
    • https://camping-du-lac-dijon.com/fichiers/23151891513.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a146044af2---taxaxobisozorekiperope.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf2io95i1uge95p7efcd9or3e2/lavuwuw.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eda7a287eac---jogimobefer.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b722e15cfdf---86445777706.pdf
    • https://vannordenvastgoed.nl/userfiles/file/tadaxabotu.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe983ee89d---75454316246.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_off0000e63a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16792 bytes
font_01_sfnt_off0000fe51.bin
c2a7dd7391f0388678d2830f69291f81759e2e6456071353e1798a4455ad3997
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 11052 bytes
font_02_sfnt_off000117cb.bin
bbf75c6644944c3ae67a5c12f84009c970a9339656e1c0f7472d06412fcee0fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 18020 bytes