Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7f56eb1d649c0f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 11:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3345eba4871f60f413479b6b211393e9 SHA-1: bb2150cf2fb12f58909652f579c08b82f7a300ce SHA-256: 6a7f56eb1d649c0f7e7050ec3084caec99120588f43936ebf868f81064e9da87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://christ-china.com/filespath/files/20210902055001.pdf
    • http://attlas.center/userfiles/file/72362696893.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/18524197488.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c7aaa2bb---tejeno.pdf
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pagorujijo.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee34ca5253---56969492162.pdf
    • https://506hlapeta.com/files/file/39768195596.pdf
    • https://gizaviation.com/uploads/files/teginasasezogimokanew.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/kedadomekedujebuperunob.pdf
    • https://balajitutorial.com/admin/userfiles/file/wobapinimawidabovulewozug.pdf
    • http://iehyun.com/editorupload/file/94273061566.pdf
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/letadefonopes.pdf
    • http://vssteel1999.com/ckeditor/userfiles/files/gimapepejexefud.pdf
    • http://identik.hu/editor_up/97754389713.pdf
    • http://bresky.cz/res/file/41189625237.pdf
    • http://nationalcoopadvisors.com/userfiles/files/26146354281.pdf
    • http://wib24-admin.de/uploads/file/95111153644.pdf
    • https://latgalesamatnieki.lv/files/file/80410389606.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16141e27fa0a82---44501714696.pdf
    • https://hotnews.md/upload/userfiles/files/8556049902.pdf
    • https://flexi-cms.com/uploads/file/81813332509.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e2983e32---67458840283.pdf
    • https://fond.ru/userfiles/file/41598671084.pdf
    • http://miskolciharsona.hu/pictures/file/40681400426.pdf
    • http://fabriziocar.it/userfiles/files/xexisesuzagidepesenek.pdf
    • https://sangolongphuong.vn/longphuong/news/files/30991118666.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/748d50b5d23591aefb28aea535f1e7c6/niwezip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hotstar+app+free+download+for+android+mobile+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 16792 bytes
font_01_sfnt_off0000d2cc.bin
1b7d5dc593511fd871878fd2a843555805baf031f13143138eb84c8e5d20770e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 10968 bytes
font_02_sfnt_off0000ebfe.bin
5f10cbcfb9c5da030fb01f4d0fd0cf0d56cb39afaafcef42a4bb414f4490b196
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16152 bytes