Malicious PDF — malware analysis report

Static analysis result for SHA-256 08eb237c1d33ff34…

MALICIOUS

PDF

270.9 KB Created: 2021-06-07 08:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 571862c15a1d3cb8716f0d914e297005 SHA-1: 9f755ac05610738f52716534969412db5986ca2e SHA-256: 08eb237c1d33ff3483a6d9d341b5e649e18b18dbb7da90559b89684a2dc7f713
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=minna+no+nihongo+2+pdf+english PDF link annotation
    • https://kis-u.com/page_data/file/20210602234512.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096a50ceecc1---rujivezuwobesunezakom.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/23073603483.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210602205051.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/02c241a9f5615b1de1490be7852a258a/30179898218.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/b1acbeb73b5ab94ba737e02fb402a95b/wosibakeloxoviseveteg.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b9dd384b---67965387125.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile/%5C/panupuzaxo.pdfIn PDF document text
    • http://candientushinko.com/images/file/nanesizunejaga.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rr5a7een8pj3f3j3qmkit51u6g/50044831296.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/tetitekulakubebeximozoku.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c692764dd---niliwanogurexux.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6o9gu24tdm4qp47k7oarmftk55/voxez.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b869ed2d8b---gutajoxidaxikimifi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051004450073499.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/to1faq99lnil4jo8dojsfjujh6/kideligejulura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00035973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35973 26872 bytes
SHA-256: 73558661547b75c1527c0a976db50208475745a462d242956f8821492b389a92
font_01_sfnt_off0003af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AF70 5344 bytes
SHA-256: e18bf52de51c88d5ff5389f0513b541f50dfa26f1a4db579fd3920f31b0b6110
font_02_sfnt_off0003c1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C1AD 5972 bytes
SHA-256: a57fc8d93aebdad74302f32f94afa23f68d5df1a3752d33130b4d5dc1ac50f1e
font_03_sfnt_off0003d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D0E9 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_04_sfnt_off0003d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D977 18864 bytes
SHA-256: 431383ec32cb15bb56638750bd064b51edf603665a9c29ca3a6d0cfcf5ceb7d4
font_05_sfnt_off000413ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x413BA 17184 bytes
SHA-256: 18a0a1ffc00f82606e5f6ee1fb75d2cfe67b512fe279965cc1dc9958db738e55