Malicious PDF — malware analysis report

Static analysis result for SHA-256 9333398e004e438b…

MALICIOUS

PDF

74.9 KB Created: 2021-10-05 01:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e30817f95bb3afc429c7bf179da5626 SHA-1: 9c5c4a09f61a679e488459e7e91b39481bb8b91f SHA-256: 9333398e004e438badd2c841a56a29c5a7cd570e85df3fe25cbb121a136717e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown PDF files on disposable or potentially compromised hosting. Heuristics indicate this is a link farm, with some links pointing to compromised WordPress uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://slide-bearing.com/d/files/94474425103.pdf In PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/98494880056.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/sagujoduki.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20211004045022_96163002.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/rekonuw.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/dotidazemidepumesoludaz.pdfIn PDF document text
    • http://robbes.nl/media/files/xobolazubosajogupodaras.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/wenisabuxe.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/98640645885.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/47947987644.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/mazorepegumovupomedabosef.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/14309025993.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613861b38b314---nareziw.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/67656502371.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lojikavumetududuxawotu.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/49362282930.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/295e8adad85b06f5afc04b2bf0053fd9/butezavenopan.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210923034708.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614437da00e41---18155931694.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/28799160963.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d016543ce2---luwojovupijupiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=parallel+lines+cut+by+a+transversal+notesPDF 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_off0000c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 17236 bytes
SHA-256: aeb44999d4dcbc06235e5cfaada6a9b7cf2bdc214bf0f5e138308e1556fefe75
font_02_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 10644 bytes
SHA-256: 41501ecabb3097ffb810c5ad8024f48fecfc289f5a81741019498f29cf1b18f3