Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d16cce13694a1e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b5b4eda9b175502d3af6a6a037c05c9 SHA-1: f2ec3e795d6dcbcd43d8d1ea4eeaffb89e796f72 SHA-256: c7d16cce13694a1e2d0442a01f72fac80ea7f19f8216fa28a75482185017400f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=como+bloquear+notifica%C3%A7%C3%B5es+de+aplicativos+no+android PDF link annotation
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/robatebax.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/wesavovoxozujuz.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/42275306173.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/28341609949.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/riwewerobifiz.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9uivtha7b0jjaa9ohd2etc3jnu/milifujavisepovanijoj.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/46447592418.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bc14ff32112d77091d2615f152b15034/gesuripadojowozo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///42646346858.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/duzonupugufubanapikunulak.pdfIn PDF document text
    • http://hadt.vn/upload/files/tozixozuk.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/vafobekikuni.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/pavupitek.pdfIn PDF document text
    • http://newcityhk.com/userfiles/56520216351.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/86688253920.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/todosowabujevelis.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/fobarekitijoditeteder.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zipatoxopiwewudolixidole.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/pifemibimexivexobekituzum.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/85596202159.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fe42de18467d3c99967a9230c76efd47/48004345870.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/22646536716.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/moxipobajosinimig.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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 11684 bytes
SHA-256: 1c15972e3d0f80038dbfc9729466e2d3ebaa2c4f833431e234e80f5b02e9a438
font_02_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 19056 bytes
SHA-256: c50da1ea11ed1df0d2f099ed4572e50dab22937b87097cca0cac0029aee415e7

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