Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a89ef00fc3fa43b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-23 04:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 472763729df3012bb56a554c0f146347 SHA-1: daad107dc92df0c4cb49f724a298fa223ce70a4d SHA-256: 0a89ef00fc3fa43b3a5212c52ac1bcfb57439d2dd98bab3f5fe41ca3307a46cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm hosted on multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/37321964527.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92907e1cf2---6618766770.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ec2e866c---zodesikusab.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/24328398624.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/10d45bcc82c2a3418c8245a034342f7c/69980849858.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/95275338267.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/40972468939.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/futomoguwifofad.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/rusamelegi.pdfIn PDF document text
    • https://curvy.tw/upload/files/buzufuzisovamijibixaweg.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/437eef41ff45b7e83b256594264f6367/22472028409.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d0b03503b---46280817095.pdfIn PDF document text
    • http://cookbox.nl/app/webroot/files/userfiles/files/15253221564.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5jkqb0ogmmk4a66uqloulvtpb5/gowuxufipis.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nifaj.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/fisiwaburemezaxudaxuwo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/38662116042.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/2134882112.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/ronetimimiluluvibodu.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/20546789977.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de8afe59d80---8920604556.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mnnqvqi9ub53ue36hnmfokkj8r/woditawipelevod.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/13513134390.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/nukexopodolijoj.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/xowipawedodemife.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/10049807677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=as+an+equalPDF 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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 17552 bytes
SHA-256: 2a896a2698542d845d50894df8ae6d6f056ff0f369e8669163ce6b95e6d359a3
font_02_sfnt_off00013871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13871 9920 bytes
SHA-256: 9b0b9a59ae1b74c2326c6da0bf543cd4b54b1794e3ee2d620814a8622e57e855