Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c862f2e19a6825…

MALICIOUS

PDF

72.6 KB Created: 2021-09-23 18:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5e88f583f39af22ee8faba01fefe29d SHA-1: d39144ce976f297bc7bfaf423b7cf578d6416497 SHA-256: c6c862f2e19a68256f3ca565eafd3c1c74fe30745b2f915ded4960b0b5a5b226
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=obb+file+name+of+gta+san+andreas PDF link annotation
    • https://hse.tw/upload/file/4239007494.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/vevololebutejefezidur.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/46875086848.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wowuxu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f51d5461---bufumevedatesovofuxebarig.pdfIn PDF document text
    • http://mariancozma.com/_user/file/99129369526.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zakozuxarinesu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17091ba97---34568243520.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/19198466491.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/5110759618.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/buxijogovebagase.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/19075661403.pdfIn PDF document text
    • https://porfic.com/fotos/file/67503195049.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zutipafaroguriwalet.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161475f3b881d2---vigukibinakelezot.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6fe0479404731e6a518e5a2d30cea5f3/sijafevelupewej.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210914180554.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/furiwipolutu.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/zewedinojanuvu.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/pikovejosowaribasuto.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/81f0fa59010adb7b55c133a2a22ec575/jabeloxedokuwadotejisuko.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/vusuz.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/95088090573.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/gusunad.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_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 16644 bytes
SHA-256: bcc1531370cce6c160713a98875df7ffa05ae0180fe0198c1a714cc7c112db1f
font_02_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 10860 bytes
SHA-256: 6931b600f1c1071a7b9825caf6b545f4feeddb2bc6edaf7a5e7a7119c74849b9

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