Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5f7a9a27fb563e…

MALICIOUS

PDF

95.7 KB Created: 2021-09-05 08:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a75eabac55dbe9ed9e55b7707393ff80 SHA-1: 4933acfc114f7f61eb6698d9440bd0d2d6af6f30 SHA-256: 1d5f7a9a27fb563e1ecfa9d9f8fdbd9aa4580326809b402d1b12c478d28d97ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.agenbenangbandung.net/file/18718481157.pdf In PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/e2e3772ab62cadb5564831b8a22b83c7/10974184632.pdfIn PDF document text
    • https://empresa-venta.hr/files/93639528624.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/zadujubufobov.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7fa511d9---duzasewixixenexinunos.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/50148703274.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee46d967---21344210756.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/13175316428.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dcf58cd9c4ef08178c61aac889946f2c/zomusuwasuw.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/midirebivapanapaxewupeda.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/36241344652.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/jexomikodoku.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/30753b69384a6a3b9ef98b3deb22e2d5/28260719953.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/626875287e14b076d55f7374204ec4d6/dulibuwewinadorama.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/23758584093.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/mekivabebuwowaxudun.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/65886391369.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mdqe2g0ball3olt1jpodlbudjs/voniwiwej.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/41551925452.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1781448552.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/pawatinotipa.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juwiwuveganuborosudoro.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vudagejejub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manual+polar+v800+pdf+espa%C3%B1olPDF 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_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 10996 bytes
SHA-256: 24513e5755673aae234e8be8c46f2a1c84f42ccf8e85da3df8dc3ee7786c9737
font_02_sfnt_off000138df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 20884 bytes
SHA-256: 2d3ef7b84687ea23a6cd1c6e8253e0bd91af3b90c32e12201dfd35e063e70b7a

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