Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd92d91cdec3c7a0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 07:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6dfb5f6d658c25ff1f13039a99be734f SHA-1: 108bd20586f554eb7b6208a3c768f32f8d269f78 SHA-256: bd92d91cdec3c7a0d3df8e9364c971b4a9121ce77e8c341ec94c7cead337b873
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://e-uchebnici.com/img/file/57313650851.pdf In PDF document text
    • http://gibisch.com/files/files/kagenonugejubi.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109192330255571.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/563709274.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/kemazebogefumosemakoji.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetilelij.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tagonomigimopozed.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff49b1f1f---96984447223.pdfIn PDF document text
    • http://halanmilk.com/upload/files/17487706804.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/80861203738.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/nukuluj.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/maparen.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/gukurujaja.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/gezalamobowadunilomezub.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/41818089dc4a048e294af57337b1415d/97114114961.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/sosixivogurujegob.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nobajikek.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/58592836425.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/vukulejaw.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/29211286434.pdfIn PDF document text
    • http://htwy.com/upload/file/zakubogovoko.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fulepi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f442ee658d---tixofipakokomivebujoz.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/28680431105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=la+grosse+radio+androidPDF 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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 10236 bytes
SHA-256: dda2c0dd5f62aaf9ac1ee42a1f8e51aa6087bb7c13754cfbacc7c3af54e35aad
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 18272 bytes
SHA-256: 163cf10255088eec475dcf0d102f587ee9fbc332f442d659a22cdc0cfa1c01e9

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