Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4bbe72c03b5d7a…

MALICIOUS

PDF

107.6 KB Created: 2021-09-02 07:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e0f2622ca4f407afaf92925c00ff87d SHA-1: 4537c9c2e9f8cd6cf34492948f24c39ea8aa0a92 SHA-256: 9f4bbe72c03b5d7aaf362c88b1d1e220b0ee1e23c1078fab20b89504fb32d5e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=introduction+to+data+mining+pdf+tan PDF link annotation
    • http://ikhmongol.mn/ckfinder/userfiles/files/53825503751.pdfIn PDF document text
    • http://recviem.ru/img/upload/simuzegosokabar.pdfIn PDF document text
    • http://teplospectr.ru/images/files/249927015.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076c38c57d47---gudodularamuvimab.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f84fa19ec51---sakozizifamesaxitefufopo.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/xulizidejewigimonog.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/8djrgjf0vbovi780d7l9ct0q21/64350376625.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/32717410013.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/71901541796.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/jodokimuti.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210803080331.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff75f44070---84960229532.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/pobupezupagebukuvo.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/rudisaka.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/41736311069.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/55367017301.pdfIn PDF document text
    • https://diphong.com/uploads/89645831748.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4c7fd9dde---56938394971.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8ef78dd9---rewinabuzuxagukem.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a193f49790e---58082870140.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6af83c44---77459817412.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/34902881605.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/tiwobobidawotakibo.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/6341360075.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/muwoxagoxumuribezususeke.pdfIn 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://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_off00013b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B92 19584 bytes
SHA-256: 8da22a96a5873834b1bb2b7c7d76816fea34ea7922e814c3fc5d8160c25e8827
font_01_sfnt_off00016f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F10 10668 bytes
SHA-256: d81338c6b5dc71036e40ab0210b04240bbb599a4a21792982962903d518b3235
font_02_sfnt_off00018746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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