Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ce2a7bbaf72cb2…

MALICIOUS

PDF

78.7 KB Created: 2021-08-11 23:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 01bb2ad5f13c2d8282232910d4bd293c SHA-1: 920e9c0728c5dcd8d487f1938b51cd697f89af66 SHA-256: a0ce2a7bbaf72cb2012771d7c76c5b2b2680ad5025ae0210a744c1dc29c9c853
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://oniceh.ru/uplcv?utm_term=warhammer+skaven+army+book+8th+edition+pdf PDF link annotation
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3d43884f2d064980ad55f3eaf6f56009/rutixaludizarozenajirawub.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/nevesimesexofozovu.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/92881375568.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fa2af81b127a3a718a9db44eb137b766/gikuzulodovebu.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/47303265684.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061402441173499.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021723919505933.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8414287175---4994763548.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/33232215738.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/favewuvef.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/59777229938.pdfIn PDF document text
    • https://kawanmto.info/contents//files/kawezigefinisitofafe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ec0a957ecbb1e3102312537daf17dc88/27205608671.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/45768627803.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1625260152bimokej.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/domeretusakelax.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/lanaxuzetafa.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b4d59f4d---xutifuvikoxajazeranen.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f303d01d63---bakufajuvajusunu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-12-19-49-09-97.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/18342522375.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/dulubupivowinigumisup.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9f5e65ac---mumajumevimewenezumetele.pdfIn PDF document text
    • 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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 11328 bytes
SHA-256: c87da44bac48dd523548d349f418a1f2c9fdc024c48c3650c77d810910b2f9a7
font_02_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 16616 bytes
SHA-256: a94f9816ddd1355669d14bff153c26adc77a37f063271bde92664d36eac15c9c