Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbaeb01e18a8352…

MALICIOUS

PDF

78.0 KB Created: 2021-09-24 21:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6297c8b615b1a0f1e437330fbb5a02b4 SHA-1: 53702bea6c7311c286652bd66b320e24f0bbf67f SHA-256: 9cbaeb01e18a83524914c7f8627b53ed9912d44a656d2bf0475639d2a567faa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://krisoc.ru/uplcv?utm_term=mi+tv+apk+install PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01d97b012---xixulimabivixujinunewe.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/80182238782.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/79571406541.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210904133709.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/99199860223.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///55696173797.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/31616764846.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/wovofipoki.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1482f12a---90302440600.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f99b8cff---60831060134.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109191250571969.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/repod.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/80338767414.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vusuwimiligiwerudidivi.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/defaratomomiva.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/60018610776.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/91792121104.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/6234910823.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/womagitelu.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/nujivovamufug.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dumevuj.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911140310.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161468d7630520---rufepesipufisoride.pdfIn PDF document text
    • http://rideco.hu/upload/file/pofibovasinigakupimebejew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E7 10044 bytes
SHA-256: 4ae791de7dcd150ecffff927b397e891aaf7eeb6fed8be080aa5425a90bd1956
font_01_sfnt_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 18472 bytes
SHA-256: bf87e1ad7371877e0b2f4f96c17595ec5b6d9ccec2be2e9b0d512aa6d9ab7d98
font_03_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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