Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab0231888fdac07…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 21:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 57bc10d8f3cc129e262a7c779347fdbf SHA-1: 941f386b7ab5df29f8025392ad91ff997d1200f4 SHA-256: bab0231888fdac075eb00d3dd083e4f38d7365076d94ed058518da13d60e8b0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the PDF acts as a link farm, pointing to compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/95518624701.pdf In PDF document text
    • http://krallarintavugu.com/upload/file/23202054817.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/7234672787.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/xapuranimelena.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/95304440023.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/nigubulenenuvaxupo.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/mejifilanijisida.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/wemijafakaloraj.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb9108e90a---88732331826.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/titajaregovajovuve.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/joriborux.pdfIn PDF document text
    • https://ferropula.hr/files/52663829574.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/94252003547.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/vugepex.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/87422692857.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614850b88c690---3961010856.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dedoretiwikamimirafusiriv.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/26275216489.pdfIn PDF document text
    • http://kccmaul.com/files/files/lononatiporo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/42f615494873b5123530f7b914bb1218/64537654170.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092004223710.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/nilifurobodexewaladax.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/bopoxopemafatofuzezije.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/22566129487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pubg+hack+mePDF 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_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 10284 bytes
SHA-256: 336fd43f6705bb2f006c611f8b668b6c029d7c3113c0073d72b52d95eaae2e33
font_01_sfnt_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 14608 bytes
SHA-256: 1409c0bfec2938d3067b3c7fa3270f725aed29f0c53b23f33c906965ad277bdd
font_02_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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