Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d72dd4c2bbc785…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 07:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 616d06ef3894395fe096cc095b8e6483 SHA-1: 94db84a5bb3c6b829fae1d50175167652c61bf82 SHA-256: 88d72dd4c2bbc78561430b4bd08afa5551c47310fa627657e07f721abd430445
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://evopizza.lt/ckfinder/userfiles/files/supifosugeradaxutodik.pdf In PDF document text
    • http://wmc21.com/ckupload/files/92568242975.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/15896476036.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/89723512415.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904152339.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/fj6ol41hiugf0s3f2j53pab253/70153632489.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/26627819666.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lematozedafuv.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210909_42EF589357137A5C.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/gizoruwewubamujirobiwud.pdfIn PDF document text
    • https://digireg.es/upload/64449023740.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/m80dfv3828eia6ind5ulq4u58g/10878939753.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6v5mu4r9tdmsubsnu88nspp9t4/wogirodubokupefezazoju.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/94310045425.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/89836223431.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/72283313126.pdfIn PDF document text
    • http://belniig.by/public/file/kikomuzevifulewi.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/95606813252.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c40858d8c---bofisekebuveji.pdfIn PDF document text
    • http://ewtch.com/upload/files/16039805185.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/524746025.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vinazodulitetowipoju.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/bizolalifatoziwulun.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/24661454983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=make+your+own+roman+soldier+costumePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/torolowoke.pdfIn PDF document text
    • 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_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 10916 bytes
SHA-256: 5fd0f05bb15a5e8bfcc6bc5d8f49e00f85c6ea6fea5dad37464b340410bed97d
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 18280 bytes
SHA-256: 0af6d477e371b574e60a6c4884d03ebc4cf2260b7124153b646f1585cf2576d6
font_02_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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