Malicious PDF — malware analysis report

Static analysis result for SHA-256 495310b23a91410e…

MALICIOUS

PDF

106.8 KB Created: 2021-09-04 22:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51843bf1729a6e85f40c9dba501fb594 SHA-1: 66e6ce1ed4f7a665554ce3fb1296ab587e0ae495 SHA-256: 495310b23a91410e0bd7825bfcce349d743c203a48aba4e2f1779ff4132f7c34
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The PDF structure and embedded links suggest an attempt to direct users to potentially malicious or phishing websites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF's nature implies it's designed to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2885

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c4f11a09---91476577190.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7c1a19e2245d166ffe01e1b87e15f0cc/tezimuwovibowepinegeza.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebbd19bc72---60700978881.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f7a1a469---70763772913.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/icbvaff3u1a3svcmic0j2sel92/92140386545.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1229f1460a7626a2698bbd7a4e71808b/kafuxugawujitezemususi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098217040e31---kozuwutolojedezufo.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xomuvivodusireg.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gonazipubege.pdfIn PDF document text
    • https://2acontractor.it/images/file/rudizagagebisebumuvuxisid.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/88492412202.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/41016736435.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e9995688f787e15a40f3d22d62eef403/lejopefaguw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2eb89aac4d2941e1c6108ec289619f53/xigepuneja.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/gosaniju.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d527f8438c1---tegifopenulirujokeb.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5fa0abe5---mejip.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608433ad882dd---54600780467.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xelumejiriv.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ce5b3fb1---30859380733.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/24862147109.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eff8a96fb---81134761417.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c7534397---51139432101.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/68222353354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2009+nissan+murano+owners+manual+pdfPDF link annotation
    • 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_off0001521e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521E 11060 bytes
SHA-256: b481633757a130b80ac32214b4e436f75492597423bc22fed4389832b2b67a78
font_01_sfnt_off00016bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18401 17964 bytes
SHA-256: 62a5ade7c440fd355cb66ea9328fc06e37ce556b54a2a4c53ca5f2b22e2768b3