Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2504be9c7e27592…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 19:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 31f4289a8e6e930d6b377ef56ed7b5c7 SHA-1: 1ec623eb4bbdcd8b73a0ff6f22528aa21e7b59aa SHA-256: e2504be9c7e27592f14f5a9208e939a67ea2ef4fa55f445843b65580cdf2c7c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160889352251b4---zebazukanodijerobones.pdf In PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f486ecb0---26867118407.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb5614ad73---70960357521.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/56998800815.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/93571889222.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/at4jp7jqsq92etbp1b4dh6rcl6/36399118606.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/tesupam.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/13575338166.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/pukigafop.pdfIn PDF document text
    • http://esistore.de/userfiles/file/9466237653.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/kelanuvilejetipeginu.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/xumubudelodudewunobakij.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/beea223b510f5454bd7f83e28321cb18/jitap.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/59303028536.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/59438804083.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85905370883.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5840e63b6---xebajaperepaze.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/60846175309.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/12776122998.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/gaponajabezuk.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c7688608212dd7a9b2ea7cfa5f7834bc/85732182038.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pevediwagivaxaliwafewo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5429b575a9371e0ac8ff4217e40822af/68531179566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=muerte+celular+apoptosis+pdfPDF link annotation
    • 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_off0000b6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 16156 bytes
SHA-256: 97b89eca529f8029e42d71f39331c4cfd1b947d01b41784f2b516b50e46e8c3e
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 10604 bytes
SHA-256: ff4ddb6277dda32a4b88e93895afea8966589cd14f2e218b7159866b8efe45db
font_02_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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