Malicious PDF — malware analysis report

Static analysis result for SHA-256 739753766a3675cd…

MALICIOUS

PDF

87.6 KB Created: 2021-07-12 22:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b456bc5a7fa37f63021535eb1558d341 SHA-1: 3d487a762f271931cf728a67fb27c7ed884de452 SHA-256: 739753766a3675cd24e4179491e825d879e63c474710b37c163be4c63ec2541e
172 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 storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=download+the+warriors+gate+full+movie
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cd5f4ccb9---10388470108.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fadb56d4---84493820712.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cc9e56da---nagofibudapalarirobopozub.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba8e37458---75051469837.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e557d923be---97626582313.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0677ea8c821be31889a2622b9e5d7cdb/mezisisijuwuzu.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f83e8d61---xawapofiref.pdf
    • http://www.anjhimayath.com/upload/file/34769872574.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/xabulazilumedotuvikuvud.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f209cabd---vofukibujasop.pdf
    • https://protrialse.eu/files/files/kotoxuzipenisav.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d5a16f44e725c58c1cbe879fcc329e5a/kukifosukinopesanatilini.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/5e09f6a32b553afeb58faaa2398adba5/dusufifevugejuxanimex.pdf
    • https://cpsguffanti.com/uploads/file/11218728625.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3e733b4e8a82649e473e92f64d8a4e38/bixoninimire.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa37ae9b3---75583852895.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e0532a124---16780405533.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c998bad3e---gowagarogazan.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdd9f38298---62443920989.pdf
    • http://pitin-akutsu.com/js/upload/files/87935288706.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93f57de0a774b3c20ed0ac1ed4e50f11/28742113193.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c188f9f77c54d78124dbc7b47f8800e9/fodavuxapobomovovew.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7c7fd2b737cf02a5c30e4083cc0daf08/75482032030.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7d91eea9904041f6aa4009ed24636528/gaxuvopirerilo.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_off0000f114.bin
be520c52ae956110e64e91d3df70841d7d1edc99a566986e7013aedbcb604c79
pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 18460 bytes
font_01_sfnt_off00011fd6.bin
cd3a9b4788facb55bb5d923dfb3e815614086c5bcc6d94c9aca4c85a54e70964
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 11056 bytes
font_02_sfnt_off00013939.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 16792 bytes