Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e8cbb196a6e2f3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 06:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df0ff81796d999648f099205b6629478 SHA-1: 90a38f55e1055fae88345295e00a393be5f6a83b SHA-256: f3e8cbb196a6e2f35b7b0fc2f77e1d05986723645576c09fbeabc4347d1490db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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=how+to+take+body+measurements+for+sewing+pdf PDF link annotation
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l63oq7jkp1j07b7vbjc9kqgd9u/xixefupedaxotun.pdfIn PDF document text
    • https://service-panev.com/userfiles/vupukasezozezowuserur.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/72483224795.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/71147083777.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/fokidovuzotipeluzabeniwi.pdfIn PDF document text
    • http://www.asslar.de/downloads/lirudo.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/vakositosujezoze.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/linupovebapuji.pdfIn PDF document text
    • https://airbays.com/userfiles/file/sidojifiruwubaluriwa.pdfIn PDF document text
    • https://x-software.cz/data/file/jabakexuwiludap.pdfIn PDF document text
    • http://farashimirooz.com/files/58913576654.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/79a09b08c8f5e833a7c02fce3fb713b1/wesumuparebemopeb.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/31e2e1058e73170a05ac98cd8916e383/81230785802.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/98247236958.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/1905332917.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127e30162235---94814038923.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kabitofifibutoguw.pdfIn PDF document text
    • http://mmt24.ru/files/file/faxugo.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/tunoda.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086de5c81e00---piwifidodovimabofol.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcea375a459---marodovim.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b57a50969---65415691111.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/vejusozutapi.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/fobiraxidav.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_off0000b841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB841 11316 bytes
SHA-256: 7c6c694fdff63586cfbd74c9fbfd02a8b8fd63f1bc67aad12d4552361885074c
font_01_sfnt_off0000d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD278 16160 bytes
SHA-256: dbd7b51d2025a74369a8c11a86897a2631010e02300dfdf1de7cd5a83a6bf25a
font_02_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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