Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b96dc24a0e3308c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 21:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b20e4769487892e07ec3dc5357a18a5d SHA-1: 60102ee7bce41f7d5abf5fae626da4fbb82b1f83 SHA-256: 4b96dc24a0e3308c65b939218d705229bd9ffc5413f80ad57939e55bdb81a1c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. These links likely serve as a lure to download further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2b3c40a58---49913313909.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bcc713b0c8a3cd735a96e991b7fdf04d/76868964695.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/furufuxobesiwiduf.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/giwagux.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208cd2a33a4---gesavijurenewus.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782935b5148---81133192399.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gifeb.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gumimotifuwugutepi.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/vajojipogaxesajogixiwage.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10443150286.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d1d77b928c9e34a6f07371260c1ada01/ketazidoxar.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/89710893310.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vetikime.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/4336215765.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/8051863093.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f6423dd95---junurexibogepu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95a35ad2e0---mefuwabotosetewa.pdfIn PDF document text
    • https://projetovm.com/uploads/files/82996335793.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210622_170538.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62e867e90---nojuzarorid.pdfIn PDF document text
    • http://lnyy.cc/uploads/file/1629220707.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210624114709.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/nagij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+code+all+star+tower+defensePDF 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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 10444 bytes
SHA-256: 5ec764b8033f23d6df69f7625b9ec416014547a3e81dc7cd6b0c04b21c2e8cba
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 20036 bytes
SHA-256: c7fc0602c62bee78a033656d4ff43d63131c2dc7f194f99bbbc6b92ffe397654
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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