Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8c1db1e8faa880…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 14:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7245bad818796db866f8fffca1efba5b SHA-1: 6242901c2c2eb34c1f01a6bed15a105a0a994e15 SHA-256: 7d8c1db1e8faa88010f57349b2cf9ffb1518754a32f9d8d6f7b8feed581e543c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://kamwalibais.com/userfiles/file/solugoxosukafivedexu.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/zusesakewijubanujixu.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/73133127512.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/3630703180.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/jikakidozolovofolomuda.pdfIn PDF document text
    • http://juncheng.tw/upload/files/81972975488.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/subemiwido.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/bulesuw.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/39316453086.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vogozapowe.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a22aa8c75---mewasebekelafub.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/76347658909.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/laromud.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/14817955766.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c85f5b88bb112e8e0b7afa134dfabb71/jaxot.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gutofizeduxeguxoze.pdfIn PDF document text
    • https://membermimpi.com/contents/files/24194200270.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613706b722f5c---zefivadejekazogixaguvuzo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613245bd3dfa1---93276601451.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vbliodoqlkdjf2rd7rpuod5h8u/kawunusid.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/dinunolawuk.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f1a720ae---binopitolazapejur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+apk+for+windows+10PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 10548 bytes
SHA-256: 01ad20dd3e2cd89df11c6171bb66991254607b4b2de857d9be5e7254b4762968
font_01_sfnt_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 17756 bytes
SHA-256: f7fbe47fd22d8f48f470b0a8780981f5243fb583fe121167954ae769f16e00ca
font_02_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 16284 bytes
SHA-256: 5287b0365d5c0618dc6c41db601a584919656aab3afc559b36d6ae3c17436cd5

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