Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a49e11085d6fe5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 23:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffbe0650841a11a0c85e2c013707fabd SHA-1: 565b5beb29f04575d606769060ebac239295ad0d SHA-256: 84a49e11085d6fe5779a133df611e29f3417eb656cce0cf6aab0949e8f66b4a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure their true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://laborke.ru/uplcv?utm_term=anime+movies+app+apk PDF link annotation
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/27174190341.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vjfe3eiusnjcknsqs5cg5ai49o/80745157240.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/barala.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/8798708540.pdfIn PDF document text
    • http://usateatop.com/_upload/files/63556315837.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/tatajizapitazarakad.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f71f3df76c---kigikenemileburuga.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/19935741576.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/4968696918.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/vusewezorajawevedafejazo.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/40350439913.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/34907056644.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/85837732647.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/52759124817.pdfIn PDF document text
    • http://afro-safari.com/upload/files/feviduwesejo.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/lonafowikubi.pdfIn PDF document text
    • https://norservis.cz/files/files/kodegusixulikimifujutu.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/6912798812.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb457ebd2---jakavinafutepoxejaxow.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/pudijinefopuzupizeto.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/rogis.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/katanuzobujopowobe.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/vovedi.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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 10308 bytes
SHA-256: 13bd14171ee8dd91a86b0796177d662d8bd97945f6e2ceff8d0c9bf73746d600
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 17272 bytes
SHA-256: 12c48bb3059f7047b80ad61c3f39ac7c77285371e4beabd9c28a09930db4f557
font_02_sfnt_off00011f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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