Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f720897ae508d7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4c636ad901deb2daccd568eeaa4bb17 SHA-1: 485fc4462ce8ebaf8d6249a21d7300051247a4a3 SHA-256: b1f720897ae508d7e6d2a6bda578499521db1b2581b1db198b88b01bee2074a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

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 https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f3ada322941ea76dce583070d7f4aa8d/mijufubukazikamebilefi.pdf In PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/piwamadirufijajofog.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/gipepugusugonuwufobor.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/fakutemulomuk.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/27896949600.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/95007673054.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6febcfeb4---kudaponimilimasoturus.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/27618606753.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lukuwuz.pdfIn PDF document text
    • http://taociren.com/upload/file/210911020343773501j6gor8ua9onc.pdfIn PDF document text
    • http://computerdoki.hu/user/file/42309125284.pdfIn PDF document text
    • https://denimder.org/resimler/files/biguvaxoloseru.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/34066568867.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902071552.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109190927529877.pdfIn PDF document text
    • http://chengzechem.com/upload/files/momokodafasawujawa.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/74868205623.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8nm3364blim83ttejk605cef7u/fudotubazufemebowisu.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/joxajexuwipizepimip.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/331907c71940cb2f26cce1003e81dbe8/posegafominunesomoj.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/6841776941.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/17195017481.pdfIn PDF document text
    • http://salespate.com/userfiles/file/57795741547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=der+kleine+prinz+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_off0000b42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 17324 bytes
SHA-256: 4131cd92232cefdd02e6c78ec24492cac4384032830a996cea3d87ff9b3439c0
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10096 bytes
SHA-256: 4ebb2c4b0041405eda2cc1112c681c47eee1c440b8764bb42e7b7fc89eb62593
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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