Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626fc5ae31c0513…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 07:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9793d02058c81b1de2b5cc79e39c0fe1 SHA-1: da570079b59ab8e701fd760ea665a26667f16fe9 SHA-256: a626fc5ae31c05135d95f7f3bd9eaa803f1115c16fb107911b85036e683603a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=cyrose+movies+apk PDF link annotation
    • https://signos.larrialdiak.es/files/galeria/files/60985466996.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/bikuwokusixagugapugod.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/tukusiwetofose.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/14252390099.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/36036690626.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/dilizomajesojugepumitawu.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/puniruxux.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/11998716882.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a049544c5a---96809760733.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/jexuzerimerizi.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/23917599231.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/48906214490.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/zajofofisofemepubasezu.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/rexebaxujuz.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/forir.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133de661b765---23105812979.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/wapoguvopiweburaletes.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/kigufosesilasajuvimezipud.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/regif.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/24d7ad0c3a5f48efa3bf2b362a07d6dd/mamimusofodep.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210914112146.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d36e69f6fa522be6b98f44f343f8f1/kisisegojijoxu.pdfIn PDF document text
    • http://ccsl.asia/files/nosowovagitifajujixeworef.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/3501030350.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/zemixematolomeje.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_off0000b497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 10468 bytes
SHA-256: e3f5e320e5bac1c1e1de7e4335275e60abaaa50fefe19c9dd49b533b46e23c6b
font_01_sfnt_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 15020 bytes
SHA-256: 19b8a4d8d3722062243d8853136883ba5a396c78aacece47383a9529c2b6e191
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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