Malicious PDF — malware analysis report

Static analysis result for SHA-256 de59b6b67d7e5bfc…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 12:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a2eb005dbbc20ac46ea833252424d26 SHA-1: 71172bcf58c53710294658a100c3e0e4f28f9a73 SHA-256: de59b6b67d7e5bfcc1e1c69eab14840045875ba0269006d02fabad48b1c49db2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download a second-stage payload. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bukharajohnscreek.com/sites/default/files/file/53112756896.pdf In PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/79222467949.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/xepewasosefagujojopixamib.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/winagizasoreriv.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/82481932661.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gapurunazusisakage.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/72952063914.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8oqtnmapaocubtehhhnmdrtsvr/vulobiriwinibed.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/fonovezesunamoxigef.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/16b46bf57b7d7ac1609caa64d5207836/vunaketavozovakinigelof.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/26597684539.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/zepapelovekuge.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/67866767264.pdfIn PDF document text
    • http://sial.pl/galeria/file/32563648156.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b482a0b7b---joxizareg.pdfIn PDF document text
    • http://terminsk.by/pics/files/davamugoxejeluporevuwem.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/61027881994.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kikuvifebomivuwerugeb.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gujipa.pdfIn PDF document text
    • http://feminella.ro/upload/fck/lazenemukemomosiwubefitan.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161405b83e6e5d---16082237741.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/vusewuzame.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/xakanadunuwinuxazifif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=power+365+loginPDF 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_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 18564 bytes
SHA-256: 035c91cc4706af4eda6d036ac43e548a7f54c0b749df7f3ca271e71a7a57002b
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 10416 bytes
SHA-256: 8ee4529d0950200866c4bcbfa52874aa2561dbc0225a1ff301a74bc14f8bb285

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