Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25c48bba5c52daa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 14:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69fae1d9134cf396540ff3f47ae00d62 SHA-1: 1b860d02d8c7331145ce4ba9aeed3275397bdc09 SHA-256: d25c48bba5c52daaafa7dd6e9cea9c3e673945ee362923118a7b8545a44082d2
204 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely to host or redirect to malicious payloads. The document also contains an explicit instruction to disable security software, indicating a clear intent to bypass defenses and facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=icall+screen+premium+mod+apk+download PDF link annotation
    • http://nilesk.com/userfiles/file/gorivokapunuf.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/487ebc6fd8da1943e8aa41f910ee3632/melamewinenudowutazuve.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b48b3ee16---42033593458.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wojebuxegaxufudujabuk.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/sirumepokovamuler.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/momuv.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/balasujamagexadako.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/pamudibexirebibiwuk.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/57851415783.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e64e5beacea00d5ed013d2b8a14e9e9f/83133507932.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613419bfbcb0f---55380618068.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2dc310bf---watozaros.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selalufulifegovatidelil.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/fipipidexajefeg.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/61790845070.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/rikejofesarununedutuso.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/70807753372.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9c3e1081---3611397883.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/nusebobalimujosagekuwadi.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/lexagomamenisigosabedi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/65808866306.pdfIn PDF document text
    • http://aa-nusd.jp/10443054883.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 20256 bytes
SHA-256: 76465ecdbc1cd2aa1f7f498f74300dbf04c5c73277b56baac120aae811e869d5
font_01_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 10808 bytes
SHA-256: 4e0254b32496e051bd3a858348c883ed03cc452f8086238c8ddac4c98375c542

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