Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc490271ce2203f6…

MALICIOUS

PDF

71.7 KB Created: 2021-10-08 08:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9e94a548f623c1bbdf6f14ad1196ee28 SHA-1: b36a9a8faaf577dbc5a1f6c1a11f6ae94e48e495 SHA-256: bc490271ce2203f6bd6147ae927933e73dbd5d17b88713b708db435be6b0eb17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7712504842.pdf In PDF document text
    • http://koddous.com/userfiles/file/jomagoginegopimusoruzel.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/fuvutizudovetuza.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/muzidepuxuvetudebubizalo.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/18755273778.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/sileligo.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/segatuke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b392663968---lotenupilejasezi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141082dc3124---91326062450.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/kifixiwubabok.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8a9795e1---37168612576.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/rekirigikirasuvumezorola.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/18302112523.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ca30fef7f31ddc0fc780f80a995c877f/vivetejofi.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/73961592087.pdfIn PDF document text
    • http://svx.su/ffile/file/1519733898.pdfIn PDF document text
    • http://canadanur.com/resimler/files/xuripefizanusijitukexo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c2e043fb---82618664345.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613573ed35be8---fupagex.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210919_010255.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/35617709909.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/wupukejopopuma.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/wenavotabusoluje.pdfIn PDF document text
    • http://blueyee.com/upload/file/260600092793.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/76812869807.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/gutagabirakerogepedegaxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=christmas+carols+for+guitar+free+downloadPDF link annotation
    • 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_off0000b5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AF 11140 bytes
SHA-256: 3da7e959ee71f2b21c875d0fe2b7ad9ea1fa5e545a0b8bc82fcfa6f14a675617
font_01_sfnt_off0000cf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 16316 bytes
SHA-256: 5ee72748f42fd3d1fa67d4e00e7b2a1af935c6bbbe80cb6fc4c8f8a9c16a02fc
font_02_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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