Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb2cdd8896eec2d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 10:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a6d192ced35c455156ad6d90ec4a284 SHA-1: 01e155ea925e0cf7a2e8b9fa03f4a4bc8e7b808d SHA-256: 9fb2cdd8896eec2da5af5e0057ac4e11f2108ebc46e897c7a8a94bc6714cd808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with heuristics indicating a link farm strategy. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination or leverage malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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+choose+best+charger+for+android PDF link annotation
    • https://anfauglir.com/images/file/46399133177.pdfIn PDF document text
    • http://tai-group.com/upload/files/88258862463.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/31455360873.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090412233439.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/pejirimosajedesolowavubis.pdfIn PDF document text
    • https://invision.buzyhub.com/files/34008731472.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xuzibarujokirekaw.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/lajiladamivad.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/17211344960.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/45770579023.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sulizilofigokuvuwekabomos.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131859b9ee0a---29825982518.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/68000592608.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/56044042772.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/kutudijaxanimupilab.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/92718307974.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/7335161312.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/94818008112.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2f0902ab---79829133306.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109080632161844.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf71be65---44859533405.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/52372401507.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133410742e13---87396666559.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/varuzaposavumizewigefudab.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_off0000b821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 15700 bytes
SHA-256: d0214bc323f52ce1c93778208941786f112405e26703197d587e4298e62ffe00
font_01_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 10928 bytes
SHA-256: e92b04ad94ab17b796cf9cde8134617cdd621f6b3e4453f9773d6a1fa48a0e63
font_02_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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