Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7e88986ad006a3…

MALICIOUS

PDF

82.4 KB Created: 2021-10-07 12:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: edfc45ee3c41fa7f308f0871b39573c1 SHA-1: 524c1afba782fe3d2a4863c3da5fba7f8e873642 SHA-256: fd7e88986ad006a3bf83e04fb14ce301b8d9fa0b1dcd4ce308934e8a7c56d8c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=silent+letters+a+to+z PDF link annotation
    • http://15441707.com/data/board/file/20210907023216.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/51732520130.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aad3013f8---61840920227.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901233213.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/jarar.pdfIn PDF document text
    • https://j26clean.com/upload/files/jutejuregimabiwe.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/51339875811.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/67622587762.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/69420946680.pdfIn PDF document text
    • http://jn-zhsc.com/upload/zorovemexodural.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/sarewozifiniveke.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/128u4a5t6lo0074t7cfg708c10/jiretamipasagara.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/56312774938.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/kirexodelavakuredebi.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/88513138293.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a8405747ae---damopi.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/93303424651.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/voxidod.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/kosinelivevesotape.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/54543028148.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210919_150050.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/54778294555.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/36474965774.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/18/file/85935940385.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/47133132211.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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 10236 bytes
SHA-256: 3de2f421b0745078d993be2fefa63e90f714d64cd5d44b722d922614937eb19c
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 19792 bytes
SHA-256: 7a79d33e17d82ee3f268bb86c4f24e584538b158b69015592af96b3d94debc73
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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