Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c08f98ba8d121f…

MALICIOUS

PDF

99.3 KB Created: 2021-09-19 02:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0051be20cc09874128f6828e68e84b15 SHA-1: 88991a3bedd5e12660f9002bbe83c8ed0499b0aa SHA-256: 70c08f98ba8d121fb792dfb84abdca13b3d13eae3323da339955092c08688219
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dulichtantai.com/files/uploaded/files/zedimukifazisapaxow.pdf In PDF document text
    • http://feldbach-tourismus.at/files/venumefikuduzewakuwena.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109071818079491.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441d94d04db---68043586259.pdfIn PDF document text
    • https://ebooksweb.net/files/file/12961061502.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/tinoxulevis.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/44428434450.pdfIn PDF document text
    • https://kueapem.com/contents/files/88229439782.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/32294402526.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3382055ad---vovuwoxowixopegigefozoluw.pdfIn PDF document text
    • https://basisnomor.com/contents/files/73173293149.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090114063070554.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d396655e61773125a1ce7702a4127383/nepad.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/67349754580.pdfIn PDF document text
    • http://furniture83.com/upload/files/fuseg.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/zinot.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/pugexesalupebularekuf.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/waweso.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/87467180063.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/18180821080.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/dosesivupusotidunodirib.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/97188130604.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a55d1f14---mejanizavobiguvosaso.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/60538195266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mega+man+x+order+of+bossesPDF 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_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 22572 bytes
SHA-256: 596fc83e530aee5cc6856c3c9678c7d59877a8707103c39f6a274ac8950a7a76
font_01_sfnt_off00014f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F04 10696 bytes
SHA-256: 86ccb491f2da3b81bd0e2502500959a5296aad5d804ab4a26531a2d263447dfc
font_02_sfnt_off00016755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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