Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb6efa49ae3d34a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5cdb3ef301566d9bd6a8ab06c28868e8 SHA-1: 2b165bc858f5cff165e7762942abf7306a0e0e68 SHA-256: 1fb6efa49ae3d34a3da640323c8dbb4802aa9ac43af5431b31c72828bb583a83
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=wifikill+1.7+apk PDF link annotation
    • http://zl369.net/userfiles/file/fefexoxododajolumezobexin.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/megegawumeduboregafisusa.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/1057475255.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/zaxut.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/riladujuvozarojil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffde6713c7---betabe.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/15534756161.pdfIn PDF document text
    • http://inspeq.eu/public/files/24482192247.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nukunubedodibimadeboba.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/buvotuge.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9ff0adebc0998dae3694068cd3e6f421/23749432810.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/viseba.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329dd82be76---ditujazop.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/dexumo.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/kepubexuxojafobewuxogika.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/66076574969.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137069c28504---59248458288.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kojowopalomewatujime.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614baa3c65668---zizawoxuvobabo.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/federazejokabat.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210912_E2DFA2B0FAD87196.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/detijibelexawijoposazex.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zotebomekozidugimute.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_off0000c308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 9884 bytes
SHA-256: 29a06743d3f29154bc78ff8c2b9d044e339866ffdd99e091b5b4a3e9efb27a0c
font_02_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 17944 bytes
SHA-256: 74701dd33eb9c7b8190ad36a39ac461e0d55877da711aa439d1f660d4919da87

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