Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f84080b47d13094…

MALICIOUS

PDF

124.6 KB Created: 2021-09-07 17:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60b96dbe8900e049a253bdc70e9cd587 SHA-1: 062edd5fb5a1debf4b399e09de5cfea20bd2c9cc SHA-256: 4f84080b47d1309498278ad3350a5de90d1d1efd45d61d22c152224b74b7f845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded links suggest an attempt to redirect users to malicious content, potentially disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9627832b---basinubowujowew.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/26635727650.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e656ba85ba---585783492.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/lufuduburibab.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/juzukomibofeliwesegesa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08d7ab2f1e---31802567866.pdfIn PDF document text
    • http://denge.aero/upload/files/51902237102.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jiqgd2jus0iaoj7eeec1j7c8ci/68610176239.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0db71c8d8---245772448.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jemigew.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/womuwopefudek.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/bc1bd4b642abe37e411e88eee64f702e/52847705309.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/25939823397.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ljet95dl3r3820csujvrmkf7r4/49995776739.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210801/file/16278536225787.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/89038183921.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/natetelapofe.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/xulibufelepoxude.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0045117e---kizudutigiki.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/9950052320.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/8101e9e54a09e1c7f1fde85b5afaddd6/51438305854.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b81f299c---92646471977.pdfIn PDF document text
    • http://gdgom.com/upload/file/210826185650086894yy5g3a2f4227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=society+social+justice+rights+issues+telugu+pdf+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_off00017ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE0 20956 bytes
SHA-256: 7c22dd0c3402f5de03b04f9fcd13ca1587f99fd205831efc6993c244865721fb
font_01_sfnt_off0001b128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B128 11404 bytes
SHA-256: 0f1342982e554ddc5d73fa458eebc6ccfa6f6e28fb1f8d4d617e780626d1daca
font_02_sfnt_off0001cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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