Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aee265996c3f716…

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 17:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8fedcc5e549b5fadf963363cb9025a6 SHA-1: 3b9f2a22deb9ed9da820bbc30b254aca4465dbf3 SHA-256: 6aee265996c3f716b1407fda6470cace68296efd47d58dd6466fe9e76b46c3da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://extracam.es/app/webroot/arxius/file/roxodum.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/efc80c0be142462430ee88ac0a8f5a95/53704106677.pdfIn PDF document text
    • https://ecoretras.com/file/19204466850.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00e2fa583a---togizipufumujolazidavun.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70476477183.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/pijaga.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/baduwoxevo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a7b80e4aade3f6c7ab0cf867a5193df8/98120453726.pdfIn PDF document text
    • http://findusafranchise.com/files/files/25060818516.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84dc75930---82648013093.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4d16a517974dc0d552581f66d6334e3d/xiduwenatixupimu.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2cbc63pkiqtbkq3flllr4ocfn7/nexoxu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0cc3ed47---13208189892.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464ee062fd---43865685816.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d249624236---megijekogomazekafo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3cff0db1---17886794414.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/50c43143340b7ed9db1243df48f19d91/57281304185.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e75c0723a---40283249087.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/5745290740.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/tazufilizexolibab.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9feca9bcfbd4f213b6a6c1be7dfdfe75/derexiwapixanowukevaf.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8a426505960842fb32a423686fe1d2ef/30071266745.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/92677691715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=family+1+periodic+tablePDF 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_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 10684 bytes
SHA-256: c5f476a3407f67136093460126b9d1872f1b4b374897cdb39f490a90dfe89a15
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 16772 bytes
SHA-256: 2fd1f6d06890a9b74440a0bba299fc8697e4bf46c353933397ab3cc44eebb756
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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