Malicious PDF — malware analysis report

Static analysis result for SHA-256 f457e415161bbd73…

MALICIOUS

PDF

90.0 KB Created: 2021-07-23 18:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 269eedfdb0dd477e7e872f196cda0889 SHA-1: af68203cbbf35767da0221b974de5c20cd1cfae5 SHA-256: f457e415161bbd73679449b60c2d01e4d43b2bc4e7b486b762215927732cfbb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious URLs. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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
  • 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.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fcd38d84b---76560926890.pdf
    • http://vonschickenconcord.com/uploads/files/vewiwira.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3067b8b64c---18634603899.pdf
    • http://bogelaipigeon.com/upload/file/91198653733.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66085912645.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d380a38d28f---sineberozovisakerademizut.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5ad744fc22fc9ab0bdd51a82af34dffc/2471032161.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2f4b5fdf---levevikom.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9ab1a87f1ea1251f324ff8143f4611d7/jisadafopagez.pdf
    • http://alpinedelhi.com/userfiles/files/49480899299.pdf
    • http://daiichilogistics.com/uploads/news_file/gulexunujigi.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e10942ea---41876703279.pdf
    • http://ekopaczka.pl/imgbrama/files/29176430102.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/69937490513.pdf
    • http://statewideroadservices.com/clients/879378/File/xatasijuvasuxudemej.pdf
    • http://katachizu.com/img/news/files/vutijisunak.pdf
    • http://asea-admin.com/_userfiles/file/20210508190816.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/8280862463.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15c31053b0---3685660427.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/74d7162580cef11bba2dc420ca382845/88709139832.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d37e58eb2---63854343560.pdf
    • https://landi-bg.com/images/file/mamokeviguzen.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/529a7a46f17d7b3ec7aa6d311e3cfcf4/vufudenudi.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/79234425979.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc02e34753---25345707726.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016fd5deba---80215801526.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=calculo+de+media+mediana+y+moda+para+datos+agrupados+en+excel
    • 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_off0000f8c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 16792 bytes
font_01_sfnt_off000110dc.bin
30e92b07dd594587301f2e06193fd6bff1288f1e8426b2f5a7243aac4c171687
pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 11204 bytes
font_02_sfnt_off00012ae8.bin
f4bbdf2b0c6367bf010931e9cedb3e597866727214bf7c3040643bc5ea513707
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 17084 bytes