Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6f37b9cf19d506…

MALICIOUS

PDF

207.5 KB Created: 2021-08-21 14:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f02473b36fe720ef6e384a2f5c91d652 SHA-1: 2aa20f33c74e8524f058ddb5351c5d45dd269612 SHA-256: ff6f37b9cf19d50602ee1a79d0a2ab62473686aedf7770f83273abe9a7ff1f7b
174 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, including a high-confidence SEO redirector link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9559

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://catamma.ru/uplcv?utm_term=data+science+from+scratch+2nd+edition+review PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/16957296086.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/dufovubejawo.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/71997017502.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zodedugeguvubunonelagab.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f34966ee53603cff7fa1dab63e573fa4/31913297629.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/kewuvubaxut.pdfIn PDF document text
    • http://unseretochter.com/images/file/povobewuwa.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/fenawowiwavekulalazurex.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607559c426129---91736226630.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eac74c326c---35837286774.pdfIn PDF document text
    • https://stauber.lt/images/files/18610231125.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/76424205830.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xavudigedepepe.pdfIn PDF document text
    • https://akvaguru.hu/user/file/xalovimavuvukijegatot.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe9d724d4d---juraguxesulabofaxe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5eab8p348mkuipaq45ru1abrt6/17950796451.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a736fda5bf---duwijeximag.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/74056859756.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc76caff0e---11971794801.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jodiwokaxepukija.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16272400301223461448.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836372c187d---34773836573.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b2462ff0b69ca097660ddb9cd22c9747/gozoti.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CACB 21008 bytes
SHA-256: b52d1581c8107510e65ab7fa0c85d6e1058ca46bd8196c0d0041f841e7f6c88b
font_02_sfnt_off0002fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEC3 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00031440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31440 10968 bytes
SHA-256: 5d524acd8c01a668229709f9c0a0d0f99e66fb344848039219d1367d3f89e388

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