Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba272aeabc9e8f6…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 21:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 659460cc5b4537eb35ccfc5c810e638b SHA-1: 5635a6e5d40adc95223fbf4bb8edbe68648cc656 SHA-256: 4ba272aeabc9e8f6f1153a6944241f81821d624a2c09af5800cf696af679a60a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to external PDF files hosted on compromised WordPress sites and other domains, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897264832d3---63074689453.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9627842809016daf54c7bc46af79be4b/pibasewuberoreponobi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/416e7651ce401cd38d0384e97e3da3a6/95501064695.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/zuburujaz.pdfIn PDF document text
    • http://jfe.hk/userfiles/ribiwubem.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/69888155532.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/11954153202.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/68484084001.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/34599321145.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7deb8f1c67---pewawosoribuvifu.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/92342731101.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/77757133413.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/92900700626.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108160136382011.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/93974020747.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/rupexifanotu.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/ratabemonov.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/903a20adde9fed11a9c75ad9e3767f6f/xeximibuwabi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sagulitisofufi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe9f8e8912---xepetulakara.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97be87549d---50383192849.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/34aa75ca79c479fb2b39b66b712428b0/kabizujud.pdfIn PDF document text
    • https://langumeistras.lt/i/File/xuzedegekow.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///konusugixidorekilakuz.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/sawodumipagupejovixof.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/vizuzewop.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/eqseehuc3se9kdr8hqfl5ultiu/wifudusudemini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=primary+school+teacher+result+2019+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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 11456 bytes
SHA-256: cd511e07ac523f2e0c94e9b31e0f2a6ceb2f38612f949eebc561e8c3c9f61051
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 17952 bytes
SHA-256: feac3baef92c856c94b2bc26e4ff5d8396b037462dc7275136882b71a861279b

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