Malicious PDF — malware analysis report

Static analysis result for SHA-256 21de3f133fda108b…

MALICIOUS

PDF

83.1 KB Created: 2021-08-15 11:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7508f7af3379ddbb62250a68306decda SHA-1: 48b360366c3bc74f7a856f9fd3cda166837d6406 SHA-256: 21de3f133fda108b271d8d3152ae0bcc9bb232373e48185056c30f1d1f8c7b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=how+to+make+a+bi+weekly+budget+spreadsheet PDF link annotation
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fdeb59b2a---rerulejamopukivukixiso.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/mitorurijipisez.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fffd7ecf5---zegodaruvenakine.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9c99312580ce6238914d67ef11a5ac2c/moranafagojudefo.pdfIn PDF document text
    • https://allianztc.ro/files/file/66397525450.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882f5d8310a---juwazinunexisomunas.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/47673124777.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/91417528390.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215141837198571.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44df197a2---65008707479.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/totakalazo.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/wobokodufuk.pdfIn PDF document text
    • http://radmangroup-ye.com/rgfiles/file/xoripadinipofodizamepe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee2d4aab4---93070194159.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/13517749570.pdfIn PDF document text
    • https://limsurempat.com/contents//files/91272273354.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/67146446186.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/421a29b44bdb003cd32c143fe1431311/38919550684.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2db150425---lawitabemejejofake.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/99089829973.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sccd2f29tf0v5ph9i6jbnuo317/getefomexeje.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ddc9qquvj6gicdd1koeeierhs8/fibopiwitamogezuvikurutoj.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/25705c94ccc03da2bc12cc41f9b64b50/xiwibukazudalomotox.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee89f9d4e68---40288163564.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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 11256 bytes
SHA-256: 4f03c8b186a9c1580a187b840a30a5b8b6cacd8a140437933417b912e79a50e7
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 16500 bytes
SHA-256: 1762b076c587567c354d396b1c29dc6885772fba5e0596c2c2c488449f5a75ba
font_02_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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