Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dda2757b110e485…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 09:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4574becbdb482407747980910d43b1a4 SHA-1: 0a1d4251a5e0215d5a54607ce4d670ea091d2295 SHA-256: 8dda2757b110e48561a7455b4821b83c51eea67d75aeb5dc06a47c7a7070435e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple PDF files hosted on various domains, suggesting an attempt to distribute malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://moulindelarroque.com/userfiles/file/vavifizugud.pdf In PDF document text
    • https://hohsingfiber.com/ufiles/files/dixerud.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/kufosoxadomop.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75422f6fe---19327614814.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a476898e33---50697753892.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/natumetumefamalemolin.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/nimejet.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/sabisivovebubewoxemowu.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/75477139966.pdfIn PDF document text
    • http://polkovnik.su/upload/file/wokupenitupitaduwedozez.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/2206587827.pdfIn PDF document text
    • http://marketingnews.fr/images/file/mofovaligufiberibu.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210920211009.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/10821914428.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b011df660---85938573025.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71654550614.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/vesow.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/pogopeferexededuxujat.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/fodabarudarefivir.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/25117965842.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/34786159138.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/fiteji.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ropazufijesasiganedog.pdfIn PDF document text
    • https://datawire.gr/files/files/mapirojoler.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a47d1ebc77---suzegaxamizifa.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/53649769703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+x96+mini+firmwarePDF 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_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10772 bytes
SHA-256: bf10e4cd4b97ae41f46cf3f1926c9bf4318cc0709ed3c750f2a2ed0695f4f9ae
font_01_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 18176 bytes
SHA-256: 3ca38d217548d6e69dd4b6c0f36083b465279ed9d02b321316e65984ae6fcdf2
font_02_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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