Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ee886959ecb7a4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 05:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76b9cb2ea31c36acff6b76944862bca8 SHA-1: 8208e71fe52c170edc11121ed2540498a872e400 SHA-256: b0ee886959ecb7a4ac2fb8b96b409f2a72c6df3a0facbe6e9fcc2060a623e468
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 disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bmfjhjk.friend-match.com/upload/files/guweluxub.pdf In PDF document text
    • http://kkagro.com/media/images/upload/file/pepikogobu.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/lujota.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/90918071846.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/jonilu.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/62176162795.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/76943601885.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/ginevaxi.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109080949152425.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/39616067092.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lq47534ha7ukat733ujk3qtdn7/rujamube.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/99257499621.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1cf881e6157e825ed3d4d55b15470ba5/40500544684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d919f0940---xudaj.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/78754246089.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27fa54178---21056202472.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b970a54dc80740c1ea016f20692991e4/webide.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/68877533968.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109021047386369.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/ninuga.pdfIn PDF document text
    • https://tigaintan.com/contents/files/mojeweda.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/31201800242.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/bejumoli.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/garabuxuwubuvugel.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/39641557462.pdfIn PDF document text
    • http://lscapital.it/images/file/65443101277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=karnan+tamil+movie+full+2012+hd+1080pPDF 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_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 18420 bytes
SHA-256: d4f3f72df09bd41045600c32f1fe6e3c0c1bb4f6b7f12df64b7b0ea1ffe3297c
font_01_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 11256 bytes
SHA-256: 6892f96ac2732a7bb22a7f8deec5974f8ebfc2d0c8974d1c006283af88a193ff