Malicious PDF — malware analysis report

Static analysis result for SHA-256 294a8df5b0adddc0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 10:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d9bdefd5e74e6452f516cefac936df3 SHA-1: b89f5144dae68a6fb5ea68a5b5c2fbcc173e5514 SHA-256: 294a8df5b0adddc06e9ea48a610a7c7dac44b2b10608f68d6cd0fefa86714cd2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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://cructi.ru/uplcv?utm_term=mod+apk+carrom+board PDF link annotation
    • http://spiregene.com/image/files/20210910_044638.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134803c0fbbb---70382149206.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/kativez.pdfIn PDF document text
    • https://orrizon.ru/images/file/dubowodedo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902055016.pdfIn PDF document text
    • http://peoplefoster.com/pliki/mopogesulopupov.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rorodexug.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/jurosakefu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/gixazeredurenulajo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0f4d9bca---jikomibujagurafukala.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/duxar.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/24725204667.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/bejajujigokinusutuzife.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267da8b1f1---jazoxowonukiwupodi.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14062659791.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/77257662746.pdfIn PDF document text
    • https://emmaushuis.org/pages/61413344004.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/44779255897.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/77544809717.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/lurosopifim.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109090516258874.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/gozejubezexuxubebodod.pdfIn PDF document text
    • 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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 17056 bytes
SHA-256: 2490eb5bf1214961c7e761ee4d7564a4ef570730849de3c989267445dcbb12da
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10260 bytes
SHA-256: 52e6df70e8fc2e931e9797d3e304e9e228d9a70e77ebc96680fae2c99df1fbc8

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