Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2ed12513e90a44…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 16:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 25b07509236f616afa15af880f6d1910 SHA-1: bc052d6f8ca1fea0187c1d1f2c86a831fbe5ac7c SHA-256: ca2ed12513e90a446027501dd60c127de851ed70233c351705e95860ee368888
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6661

Heuristics 5

  • 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.
  • 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 http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/562278347d14322826c293963f777f9b/vixuziriwuvuguvolorumujo.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f54aa568---43522525736.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/eens79nn4cfl3q19m8u0nhs841/21486020771.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848cb109da8---kokotenekazogudakon.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipokazapivevivujifopo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/dae1ae1193fbd72ca27bd4f89b1dd6c9/fabop.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kanabegozafexiteb.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/xavudekuwuwazave.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c8b7ba3f---zivuzipizow.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/51a3051f016eeb15541da993013a6db7/22637900334.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa33818c0---34151899161.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210531170329_1689159948.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/743f5d2c94ead95d4dbcf65d7dd2cb01/kofapamagologu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/94b7f67927ccf5c6b1ce453f9de0006a/57358144516.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/debalijurebat.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7fa58752---burumin.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/45118951299.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qpbb57ngulqgr6fkkeonsbu5lf/58996531092.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/disosalopovuvakudoka.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d452c170---vodoxakamanevifobog.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210717081600.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24e1c558dc---bimowaxogamexor.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/v04373rcn9mmp73098pj24nhno/lukejolawinebusenejojo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/denarurugulonisomowabaxu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ang3aknrvepk2u4jmvt0fn2aql/39050909325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apa+in+text+citation+web+pagePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 10544 bytes
SHA-256: 802d1b85bb6de297c16afe4c019473037053dbe1ec5bf81b06dabe3511534927
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1