Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6480b1ac8847cae…

MALICIOUS

PDF

76.6 KB Created: 2021-08-21 19:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9e990b90dbc139ca06ad25e061d2b64 SHA-1: 1af887e94fcdf695d2dc725ed5fa5710ed101c98 SHA-256: a6480b1ac8847caed9f8097e3a0e4d911e959ec1c50716a3bed0894890154313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medius.sk/userfiles/file/kapinemasodaruxugem.pdf In PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/xavowusekirupevilufofose.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f24312cb5---zaxewanuwipipet.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/gigodotujagemevul.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/24258525473.pdfIn PDF document text
    • http://palami.by/images/file/dodaximaxog.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kg2rks5fhc451fonkt2ba899bk/lurememewujufob.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/22183756072.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xajive.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3d5897dd288819b8ff1d824db888d72a/15375004236.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/xuregasokebomivabaku.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/lixufinuxajesetatibodexow.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62400540353.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dcc8940be---6015667115.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4d23c338---nonuxuzipa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5lebtle3p927j51lqps8fuu1av/14917346855.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f41f317c748---88329880378.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211dbb3b53---tejirowaf.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/65740370298.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/bufewatoda.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088924427296---gowubodeni.pdfIn PDF document text
    • http://www.asslar.de/downloads/zulefisozez.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626879884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=area+of+composite+figures+worksheet+4th+grade+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_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 16556 bytes
SHA-256: 8befafa9d545f3f8416a63109cba5c5dc935000f1cdae40ceab272da3e4d08f3
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 11252 bytes
SHA-256: 755a59998bb8f54822b8bbfcdb82dc4f4c317049d57fcaeee4bd711589d9629b

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