Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9e7b763268c1fd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 03:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 080d2ec7429a298d4b16846e6e074604 SHA-1: 57a951d802afe67962e582e320cc2ea423d1d854 SHA-256: 9a9e7b763268c1fd209e8b4c26b8c5d2b2df3275899fd8fa38a689fbac7b07bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Heuristics indicate it's part of a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/18105934508.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/325316284f9cf373d34e18786f6fa997/nidikaxerigomodezob.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/rasegavifetemogemexipan.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56aa3a5ed8992f76b7e684fa09b69147/93008202691.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/50525314552.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609451d68934d---sobubujebabiweguwu.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/tebobenenajo.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/49446413502.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/67295517104.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31428564585.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/nagikile.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/409d06b7b69ada05eafab49f4b4e87b8/weziwijugef.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de0838cc2---40560688303.pdfIn PDF document text
    • https://led7.ru/file/daxivofexin.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/guwibunidutabaxegonona.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/53ec0b3897fef01384e4fd095739253c/46843832543.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07c95d6ad---tidunezi.pdfIn PDF document text
    • https://brickzoo.it/file/24675043729.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095bae02bc0e---89335145182.pdfIn PDF document text
    • https://network-italia.it/file/98962077180.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0vdcljncr1oddd759kttmi6c91/50247028275.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14a350e8e---24814162556.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/dedepulupodukuwovuk.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608d56e98cdf3---29012837491.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210610_161300_7897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apartments+in+brooklandPDF 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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 17084 bytes
SHA-256: 8f34de3f151b8f2332bb0a3c8ad6997a2fb3778df2270241f89ea37bf20d7a00
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10764 bytes
SHA-256: a518c477fc9144f9de82a682f9b33dba48bb3da0a40febd691a9aed6b4504e8c
font_02_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1