Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59e91245e803f3c…

MALICIOUS

PDF

91.3 KB Created: 2021-09-01 13:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 845cd8d03a0ea20a50c236e0ca06931f SHA-1: ddc7d426dd603cb349629a480661e172df2b5eae SHA-256: b59e91245e803f3c318fbbfdc26d5bc7eda8735b7c43487425f6d3957f6b1de0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/2c32e45678502deb910c46b27172cffd/wakovasofanesotevukuladux.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160785fd823902---kakezejinamovidebujoro.pdf
    • http://cityclick.it/userfiles/files/nepugapipivonazugod.pdf
    • http://chaukitchen.com/uploads/files/faronijilu.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f444f88ca4b1e06887e0af2e8eba2f8d/wufijokitukivozilugediv.pdf
    • http://kappp.ru/js/ckfinder/userfiles/files/4783078142.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6c6e4c124---49498971629.pdf
    • http://ei-windykacja.pl/upload/file/febofineker.pdf
    • http://neza.cz/UserFiles/File/wonugipoxelowana.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1785f37f3af1272db8ee556b7fa769d9/laxalofemeravevigoli.pdf
    • http://dywin.com/uploadfile/files/31860024929.pdf
    • https://indobaliart.com/sitefiles/file/18395107106.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7807316b16---vibixa.pdf
    • https://castel.ro/userfiles/file/35279328997.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c35782065---92537311266.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c56108c8f93---67699613451.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf84e5325b---somebafusiwarugojowip.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/02303d575aca9f7965ce75c3d4929a46/94112983050.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6619ad986bcf164fd5b6c3c702ca2b84/24212281215.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/45720548481.pdf
    • http://aldo-ins.com/userfiles/file/vivogufidogo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c2740307f5da18f32c3943fa3a206e6b/wilor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=co+guarantor+agreement
    • 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_off0000ffa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
font_01_sfnt_off000117b5.bin
cefd2a6777bc875b213436c8ab97c9cc6774f6d3bf51eb18a5b5e41565330ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 18796 bytes
font_02_sfnt_off000147d1.bin
e80e71dce2b49370fd44faae116d05ecdac84f96fc8ee92ae60b3a296f4f27db
pdf-font-stream PDF embedded font (sfnt) at offset 0x147D1 10276 bytes