Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc44e3e95a014ddd…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 19:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9da2f2597888b4d5d0482e03904f7c54 SHA-1: 0078fd5dea527ab93be66e559440a7ce84969f08 SHA-256: bc44e3e95a014dddaf5695425f1ea3e8ec3a21c9b47b4685c4eaea0bec1f082c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oasis-travel.ro/files/buwikojoxafaxifereli.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362427d065---89617468628.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/rofemisosinixukazipekore.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138194a5e0da---8779101282.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/tazogapokoji.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/bamifexurekek.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139671543425---waliretafezodukujevidu.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/xaromamop.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/nefesawolanuxuvabije.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/lidumizunagi.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/rapemevulojalak.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912194840902885.pdfIn PDF document text
    • http://maxbrio.kr/files/files/23849122296.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/zewedarafotagegixebij.pdfIn PDF document text
    • http://ifap.it/images/file/maxowewaberuluvibeseb.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/bijikotidat.pdfIn PDF document text
    • https://soechi.net/userfiles/file/sixejaxuk.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/5186353348.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/26735286367.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45879103750.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxisekefira.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161382064b3767---waramafapadef.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b6494608c517720b4137fba80fbcdeaa/ximumesatewenukolatabi.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/26202956934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=auto+close+apps+android+timerPDF 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_off0000cfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBC 18108 bytes
SHA-256: ba09004892c38b94a7bd0bdae98c75e249c56c96d3549315de479739357370af
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10756 bytes
SHA-256: 7df8ca6aaefde9658ef24404b0291c1b1e107dfe6108a86d33c036f4e5d049f2
font_02_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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