Malicious PDF — malware analysis report

Static analysis result for SHA-256 63acfdf5e1a9b771…

MALICIOUS

PDF

98.0 KB Created: 2021-08-10 04:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52a2bf1a1bd0053d6360e7b6b8aded4b SHA-1: 88f1710c787171cc9905962c71985e0f26c35b20 SHA-256: 63acfdf5e1a9b771208544c523dbd903842f8ed9fdeceb6e211b82fa7b7cae94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://coretry.ru/uplcv?utm_term=the+things+you+can+see+only+when+you+slow+down+quotes PDF link annotation
    • https://bakwanudang.com/contents//files/xevuvavodipa.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/milef.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/iegq914ekr4j51an1bqp5hqi4j/55976573608.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608400a1cade5---luvew.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/sadoxedizawodiloxivojolot.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/latira.pdfIn PDF document text
    • http://flgr.ru/files/files/purolupawivase.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/70758106889.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee928075390---lubawafavux.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f5db68c1---rosewotamov.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/zeraxu.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zaxulezasoteno.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/esq3pcdkueuur1rapn172t0343/44648179184.pdfIn PDF document text
    • http://laduses.nl/image/file/dobidexiwufoxele.pdfIn PDF document text
    • http://someteme.com/archivos/_20210619130104.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609795412cfd6---norosawasekefiliwit.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/90643163560.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/87234167866.pdfIn PDF document text
    • https://bloomeng.com/uploads/fejiporufoxupofalavuxe.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6f42f6c5a7713451a04a80aae029dae9/7871583355.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4ihu9iim6jtd4ne5m6cicbfa00/59361084538.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/gasigumemenifafifat.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/94609448582.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4a2e0f7d446ae5a90b9af6fcc093b4f4/kabexexakipevoparusu.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_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303F 10956 bytes
SHA-256: 9005510484421c9a520d67b8f65d9f0ab8c899b1c9eea6c95d7e08ebdb7912ad
font_02_sfnt_off00014933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14933 18376 bytes
SHA-256: ce09679ec0f9be722991b16fa023956c9705ce6644f7d3e2e2e40e11f932eea4

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