Malicious PDF — malware analysis report

Static analysis result for SHA-256 4934f39d67d2041a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 21:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c62873fd1f683f64c0f2ed25a3f14863 SHA-1: 16ed7298303fa66c76bb248bb7f5c4f1c86f8236 SHA-256: 4934f39d67d2041a42d139f993a7c8401196ea9ad4f1b681d2dcc893f4e56bda
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=el+mejor+emulador+de+gameboy+advance+para+android PDF link annotation
    • http://zh-huaxun.com/uploadfiles/files/soruxakotirugu.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/jufepoleronedurupofen.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/kulinonozovofomewobupiseb.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/35403548135.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/55872502159.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140dbf7e24e8---votuzobuzap.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ce48c261---92628601583.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/nubep.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/54397650402.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/63065933396.pdfIn PDF document text
    • http://erex.hu/upload/file/noluru.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/jubivepuwovumomo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/xosopetufalimasexeret.pdfIn PDF document text
    • http://juentai.com/userfiles/files/monapedesu.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/labodenurujudasulupe.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/84877160369.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/wokalorawu.pdfIn PDF document text
    • https://senegal4d.com/contents/files/35309802708.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161415a3d6d792---sogupepobenujasag.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f47b5781---19747621739.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/bizutapagusodupa.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/neluniwekewavogenirenogof.pdfIn PDF document text
    • http://sswjeans.com/files/39227435127.pdfIn PDF document text
    • https://breedlife.com/upload/files/68256568408.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 11124 bytes
SHA-256: 54b925e69347de66069435d58b0bf54c5b5bf2648f2ff2b265848e2ff8cd5656
font_02_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 18516 bytes
SHA-256: 60e0792d9ad85d2079afd9c97ab76626a69900c933df1ad46aa39db483e5c143

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