Malicious PDF — malware analysis report

Static analysis result for SHA-256 9526addb41e111e8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 20:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e10cd0fc2f042f48f95581be75af11c SHA-1: 0011fd5367613f899e3a53d340fda817902640cf SHA-256: 9526addb41e111e83a2a218d253620d1a72f7795ffb39ecd8fbbb3081cc822c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The PDF's structure and the presence of numerous external URIs suggest it is designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://karcannakliyat.com/userfiles/file/xakifinupuzuw.pdf In PDF document text
    • http://peneleos.pl/userfiles/file/34124372120.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/67307402020.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dujilazibigebajimijojuz.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/kunid.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/45908940147.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397ecfca148---39459676728.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/gepuxanutepizotemewavu.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210902174929.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/26088441795.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7a4c5f794c290cea1850f69e453b6cc3/ziwenoz.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/senomazobitevojub.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/zikugobosunupur.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/regujugizifodopelaguwa.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lorapiv.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/99803861345.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/mesalotitatosaxixit.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/82731711116.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/renunisomaroxokilokodofo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gloo9q3kmn8knmtq9ql9mdjg9o/merelaguxugesew.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/midogikexevomilulixusu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161303922d0e6e---19394435559.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5a128e27---34735748248.pdfIn PDF document text
    • http://na3.it/misc/file/68355983606.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/toguja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=como+instalar+todas+las+aplicaciones+de+android+en+la+sdPDF 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_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 18384 bytes
SHA-256: 5aa4668280fb834ce9b97a5bfbb9ac2389b79f96a3054cab2ab145087b37da6b
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10708 bytes
SHA-256: bbd3aa5ab4f1e8a7d9d8fd31b8a020b0cc04f48d83e85373e1917e3f1c628882
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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