Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8a85a7b3411620…

MALICIOUS

PDF

79.6 KB Created: 2021-07-25 16:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 65e7d16b6b580759acb28c769b697655 SHA-1: 0e4341ea4ea492d3fffcc1ad827de1f346a3749b SHA-256: eb8a85a7b34116209b088fa3fbc860e15e8f1da7bb96e764270d333110504f11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous embedded URLs and the 'link farm' heuristic indicate a primary function of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

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 http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a860e566---61711659467.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/rixerimojawazexuz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p1pti6hdos7mki55le96jdoh80/49545938859.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/jetuwanakunukopunokuze.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/fojetupoxipetab.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/dizajasisomelid.pdfIn PDF document text
    • https://ancoraeducacion.com/images/55295111794.pdfIn PDF document text
    • https://factinet.com/uploads/files/83786188967.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/b8tcdmo05a533echqkbf2ov9e7/roxorovonopimo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dab08dd2---laginevok.pdfIn PDF document text
    • https://superpart.com/files/fopurosofolulifuzalej.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608161bd6a62e---nibuvozurijifatejomamote.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/90257000778.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/07j81mnpa284vlbonl5t47d38k/sazijiborin.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/vaguvoxifikesitej.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6f48580fc9413f68a724ce815baa82ca/regoziwi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001fa6c65d---84926868992.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/wamisoxel.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b0eb792c7d7ddc8bd109ba2831b26c70/rojazi.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/68030662363.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105311451001053.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3a4e4e1b---55916517451.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2hacvmn9bso3f4jiplllfs6ure/gokavoroxaluma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=inventory+management+procedures+pdfPDF 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_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 16956 bytes
SHA-256: 950ab9811d00945d73744826e2f9fd77b10b1f107e0b20d8ff556e72425ac8dd