Malicious PDF — malware analysis report

Static analysis result for SHA-256 823f00af9c7ee76b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 16:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e251d79c36aef75bfc23f2ca2048fe0c SHA-1: 84b5158c0c7ba6e2cdcdb51cfaba4548887a8a50 SHA-256: 823f00af9c7ee76b7775918f06f32eedd4546d667bdfd61830711b358d0b0bbe
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4237

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=samsung+galaxy+mobile+wallpaper PDF link annotation
    • http://guchen.ru/d/files/61348863802.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/xedav.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/mamuxuzatolibib.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/milekevusopafu.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/23500665304.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/lewuzipelagozifisup.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/notufipopesowefove.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/73823299142.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ba766e7ebca6d2beb509aaef0f303daf/kimawix.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/suvagumazemiz.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/21788082473.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vudiwuwexumibuxosurem.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/1074843012.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021912114132831.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/nifofizojanesegesodabul.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/fikoj.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/nefixebo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/42491363461.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/lasogemezosafozuxaw.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/02f1435ad5652bdf1280e9d2f9427645/20195967703.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/wuzogepojimaxub.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc57241c80---rofomi.pdfIn 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_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 11112 bytes
SHA-256: 670bc454dea9ba695b089f38af666955e4174d5fa68bbc62ebacb1f643c1dc61
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 17120 bytes
SHA-256: 41bda739f01d92d10c12361031781d5e1ce32d1ed2803941edc072cd1e7d69cf

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