Malicious PDF — malware analysis report

Static analysis result for SHA-256 97340033c95bd8b1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 16:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed4bd82346bc64d37f57c2e7c84fcbce SHA-1: 5807bb3d065af57db365da46168ab14583eefce1 SHA-256: 97340033c95bd8b1d366703570df8b4ba320125832d7324101c0b2a354362d97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 http://songhandiban.com/uploadfile/file/2021090316295073499.pdf In PDF document text
    • http://sumosushingrill.com/uploads/files/92401847261.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/15514962480.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/28499807324.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/68800046999.pdfIn PDF document text
    • http://yepuco.com/uploads/files/65741402375.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/rupamubuvufurulowipasiz.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/61543218855.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/3378067666.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/39a469ce300f2adba1015eb8a73968de/wajafubopemenanopupelole.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210905_235555_157.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/fosisipituromikomalumunig.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/tixefinutovusixovodufe.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/27494305687.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a52614a1764038de2fc83bcfcc580f44/92149117969.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/lisajetupasabogebimew.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/derolowenewegagururuf.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161377d18ac322---jomaradirarexif.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/mumuvowakarax.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/ruluk.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ledenapowunifeluzuseruja.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/17153815504.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb0182648---sezasesonepozega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lockmypix+secret+photo+vaultPDF 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_off0000aea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA2 15080 bytes
SHA-256: 4b20286d11b56a00fce694a1ee4bf3d9258339fd7de6bf254e9467492fd9c3ea
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10968 bytes
SHA-256: 5aa6d66d736b0256dfd1faabd969d51fc34c0a8535cd003bcd80578c6be8d344

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