Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4b93fdeeb93ea7…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 17:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a6a29e1c26c7f38b717e7aa066d2196 SHA-1: 7984d0c198dc34161285737bf48042ad5138e1a2 SHA-256: db4b93fdeeb93ea7c6845a2e4705294e1f09fc66bffcc2c60be0cac88e19c9dc
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

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://wastran.ru/uplcv?utm_term=simple+bank+reconciliation+template
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/aafc23f22ff6c4aea526e1a40ffc6ff9/kezadawowedawosokemegijo.pdf
    • http://gianniarnaudo.com/userfiles/files/xisikipamunugivudili.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/et7m0uahoe9rljko29qb0054cv/jiwurijixijirugizato.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/99d71fcd55af02a8d855ac5a5a48d3c1/zovewivapozafuvirukisonow.pdf
    • https://gruppopolidori.com/upload/image/file/4729750343.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7kttd4nokd0j113v8a8ni6nbuv/21253953511.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0979c4795---4351668333.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/a0g9ln8iv2gum2bp49dn8qqvb1/minewokamazoruvevulikofo.pdf
    • http://atol-res.pl/uploads/file/90072229972.pdf
    • https://samarpanbharat.org/trila/userfiles/file/ravag.pdf
    • http://cesurmakina.com/userfiles/file/wiguwofejorufimera.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c603a7ad---13706134712.pdf
    • http://files.ibiza-ferien.de/file/ziwabonevebobajove.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed5382398b---93065660177.pdf
    • http://casier-a-bouteilles.fr/file/mafezapax.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/42819261756.pdf
    • https://landbondcorten.com/attachment/file/95d497e5baecd5ce219c3f7202be6842.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c771205a70---1006605586.pdf
    • http://studiofapas.it/userfiles/files/16637338094.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/fogebegomabikediruvupug.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ab1a6a5a8246b54bacd9e412fdadc076/kosudenatowokip.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/39233292624.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcce7c4772---gezivowosisurav.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/eacebef8029e1d57c4e56b1a8fb96833/populewapawudizodex.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_off0000f7ea.bin
28d98b1e14b694080dba9c94a257d32888b8e54bf462ddba9c3e60c7f5552b11
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 19172 bytes
font_01_sfnt_off000128f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 16792 bytes
font_02_sfnt_off00014110.bin
646bd26c2ad673e5664b41b5bbc2ae16fe7fad93d11341029fb4e598aa2eca1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14110 10676 bytes