Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f4b3eb0ff2630c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 18:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc8de9bd2aa0404c34db6dc44781bea5 SHA-1: 649a6ddec35cdcd44c395c9d868331f836f4d755 SHA-256: f6f4b3eb0ff2630c621e65f8e441c8a50512fe1efb18ad86e43d7586b7ce28f1
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. These links are designed to redirect users to phishing or malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=swift+streamz+apk+mod PDF link annotation
    • http://studiofantino.it/userfiles/files/31654343427.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/14205433013.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/57383846660.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210905094959.pdfIn PDF document text
    • http://netflor.pl/upload/File/tozelifanututipe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1faf06060---devan.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/jemewagiwagi.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gedonafagizuri.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/kemoj.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/65661973117.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/mitagelatuxifomibife.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/munumibuwofivurur.pdfIn PDF document text
    • http://sun-tes.ru/files/file/jetamuxigino.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/3608537333.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xotewesof.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161324978aed0c---dojavodamirutadiv.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nilekamobokunonod.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/50817278114.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/51676469531.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/vewuvubodizidawowexaxep.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/72676940986.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021910826366520.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314a00c8d07---73644531964.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/wetowoxema.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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 10820 bytes
SHA-256: fc93c962925ce325681bc7b24af9082f89eda24dab77b708d4dd59d55e09c106
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16636 bytes
SHA-256: 682b2539e160b53691a2fa43cf927f83358d7ea6dda7d42785acfa0c933321f3

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