Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5d0e983734225c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 03:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88fddd2406e3427d133cbd8dba66fe7c SHA-1: 9eb72aa6febbe56f9ba782b8a90aa3e9cdb502e1 SHA-256: ff5d0e983734225c97e42c97c403d8f9724a697738c5840bfb2cb2b42a4bd847
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=ielts+general+writing+band+9 PDF link annotation
    • http://www.bash.cl/media/file/dopebozegev.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/be30442d92f8a9925632066f79c0f120/32213204657.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wulazutaxovimezajujo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2cc5c71802905d71b0749494a15286be/vugorukeluvagilotitujaved.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/c8je8pvhenp7odfljqkb8v3tr5/wobanaton.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/24036716614.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c079b3f67---mevanelamupadoke.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3a4c484fb1ecc2e924adf35040efb93a/61479566119.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/firanirobupotog.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091c01eef62d---fatax.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c968e25489b59250ff18be11f70d3be6/raganug.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tefufuxukekeriwusora.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/vaditexiwu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c65857d0---fegofatetufu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/6247705026.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210814195742.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/joleribemovat.pdfIn PDF document text
    • https://sambelteri.com/contents/files/58988305268.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fdrc6g036nmvq8aem3ibt8nro4/17864608358.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff704b47996d10c1e9be9e36b97e48e7/48307101459.pdfIn PDF document text
    • https://ka-base.no/images_content/file/zewudewevosifam.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5bd1hckt1u7s3op7cofp2bhp6/98946886117.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/febivazozipowomisofajabol.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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10648 bytes
SHA-256: 0311bef1d941290bea98acb4fa94fb9b7a4ef04cf6428f0d199d6c6f152106d8
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 18388 bytes
SHA-256: c4ffc6a8d41719323d3d16dbdcf021b3e489d0d7ec9db445b994fd90eb94e7c8

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