Malicious PDF — malware analysis report

Static analysis result for SHA-256 951b3ca76ab31115…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 10:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36a2e4f593bc85b74ada2ec8af18f17e SHA-1: e023d66c346ed88c41f523c54b95accc7e7b7905 SHA-256: 951b3ca76ab311156a58adb7778877568ae84ee3886a0491cb8c27e3ec31f036
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The sample also includes numerous external URLs, many pointing to compromised websites or link farms, suggesting an attempt to redirect the user to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=current+indian+date+and+time PDF link annotation
    • http://stauarchitetti.eu/userfiles/files/97563354818.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/panesefomaxuka.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5e5320cf---62008365775.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/93004086782.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/ditisanibaxisazajuve.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/59498416475.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/32260460704.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/digamasurit.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109141157192362.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/gutabizunexenifu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/simego.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/19931465949.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/xubis.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/85967850823.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fevidejewowevivomewimavif.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/mipopuziguxirotakiniborig.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/nemanasu.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/66142443768.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143b678c3f07---29924640054.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363512a2b81---gekixalalodoxugepibu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/64540419214.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/wepawovomonag.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/2089207048.pdfIn PDF document text
    • https://ayurmitra.com/files/file/87378466912.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_off0000b3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 16956 bytes
SHA-256: 9a835bff87b340ce25a02a345edd0f2463386203ee4b2044fc19d09278ada732
font_01_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 10208 bytes
SHA-256: 2f80bbebb1159357a9ee65836ad706a5a07bc89594b3f9061bb4d12fe46a6ca7
font_02_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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