Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb794868d94300d6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 09:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0da34eaabc58ac8d691c944fab662ad1 SHA-1: b55c4ec1d77e3358e3ef369453f91d5b66b813fb SHA-256: cb794868d94300d676eaeb0871108bad2307ee96208ed641b67b6c050034f601
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fijiembajak.com/uploads/ck_uploads/files/zaxilivomabiwulefisesal.pdf In PDF document text
    • http://studiomarazzi.eu/userfiles/files/44680972404.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b5dd83c383cb0d02454f9d40d84c2e90/diwomexeweg.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/mebilawuv.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/88552114125.pdfIn PDF document text
    • https://soechi.com/userfiles/file/2312844504.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/xuzuxazavovibowibuwiza.pdfIn PDF document text
    • http://888chji.com/userfiles/files/73846860430.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16139be4a578ac---54005520603.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/25816452305.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/zojuliwosem.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/70551912771.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/87654101063.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/13104270332.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/86843854695.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/35858467342.pdfIn PDF document text
    • http://hainfelderteich.at/38905280427.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/14528540980.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nuwanafixax.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/31952978003.pdfIn PDF document text
    • http://centrons.com/uploaded/file/30622707861343a4384679.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/lowikib.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a5ee4e4f9870333439140b5a5675cdfe/10614299125.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_139923376DCAEF85.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/wizebepuwerodemutapuxaw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614822a30cd96---karitataxuzefegosajok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=smr+recording+apk+downloadPDF 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_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 19036 bytes
SHA-256: eefc461cdeb69246440a3098f1a28f23889a2f30630b6254e9560b59f91f3e65
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 10844 bytes
SHA-256: 29581591ef009423c21f010350ddeec4a95a9bc073c16a7c40617a58600d8800

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