Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2c00fded65fcb2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 12:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6078b7ad4d0e21cb6abe79d27570cacf SHA-1: 9632563495d51761641c288eaa5e47d302108e72 SHA-256: 3c2c00fded65fcb235fafd4b1076baf87a70dde519020c27da12d6a6740c7420
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=buy+likes+instagram+app PDF link annotation
    • http://toyotacri.com/userfiles/files/meluvusutamunogaxum.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109070036184490.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/45608911562.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/68502298276.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jopadal.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/6018437081.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/37929785063.pdfIn PDF document text
    • http://attlas.center/userfiles/file/84658132350.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/monifebej.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1551fdf0---60605428651.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b209ace5---xijugagosem.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/20855716769.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wakexukewulomowana.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/3119680440.pdfIn PDF document text
    • https://agatanorek.com/files/file/rotiwowitawakevujen.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613815ac83bc1---luvuniwowutoxititemim.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/sufamelesoxigapokegoz.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/duwezexowage.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/bikirurakosukixudo.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/86040941139.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/bowazusibetedogeditijog.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/tulapiwapufenimibebizilir.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///xufabifulif.pdfIn PDF document text
    • http://mq-water.net/upload/somanedoreridosemof.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zumovete.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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 17824 bytes
SHA-256: dcc5f328ddfcef243b64bff5447168cfc9e2b66e36a457f5e00898e1953a3450
font_02_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 10832 bytes
SHA-256: 9d4cac4ad615fffc26fb1011b83b5085ef0c58b8d71a397717cd2cf23bf4f375

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