Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d502ba417835fb5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 08:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cc1886c3b3ff0527737c5bbd04f349c SHA-1: cd279aadb923fa2335d21c2b3f69a1ff372b0965 SHA-256: 9d502ba417835fb52256c5807400306500b04befab30ecd98b9636decd3cae06
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to facilitate the download of further malicious payloads. The presence of external URIs and a 'download button' heuristic further supports this phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://telenovella-bg.com/files/vejaxuzudiniwofebopemepe.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a4cf28f8dcd775ae3ea8bc3eff9181f8/61719080968.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/72868076741.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/diwuforewi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bfhi63eedegkd44tpnhob5ualk/68006758765.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sawogifiburumiravir.pdfIn PDF document text
    • https://abeess.com/userfiles/file/28197792704.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0ee2d50c---xekupekatob.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e044ed8e219---52944769428.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/30863597842.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160987732b3588---78409127146.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/7937984119.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/27718845007.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/tedevef.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/jilagizevu.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/52782540721.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/hnip2t36fgu5ceq8no8ch0n827/kedofuxavokazawok.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/zoxuxorololu.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/gipivi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/gp5bmavlao54mgruh0rdqce3h0/poluposubuzavepif.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6493ed57---11788701134.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d2e90040---14859492240.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/zikavudodixokidob.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/zamumotofugamupexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=present+simple+present+continuous+exercises+pdf+elementaryPDF 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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 18136 bytes
SHA-256: 1e724fa7cc0b92d44a70ebec548668977f87fe8366d1f0af79e9639343048aac
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 11100 bytes
SHA-256: 0a00278beacf258bec4ac1ebc0452a69c8c1b7f88326e51e8735910fbaa9d33b
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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