Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf810fb442c4ac3f…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 01:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83aae1405d6285a5df64107f7d761abf SHA-1: 7d5f98c54f85bdd3c9d7c1ad6d0f7d2f7e1d91ab SHA-256: bf810fb442c4ac3fc49c705959510b2aa1020dde11ad20465f17536c1cfd84f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely leveraging T1059.007 (JavaScript) for exploitation within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9711c0de49d4886d93e72c2968a36e3d/66118888860.pdf In PDF document text
    • https://medosojewellery.com/userfiles/files/fisubigowip.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf204e1e99---61421639891.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd707aa5ec8---gabozavazofebuzimab.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2facb064e---bebazezokir.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/20128010282.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/54926886516.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d59835d---87901598878.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609022f29cf92---rezutasat.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079e30b0350c---50634001315.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/tavonofike.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d8ce9055---rubemozomewo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/4634451768.pdfIn PDF document text
    • https://schmitz.cz/res/file/9127007065.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/bopuguninofupifivosanapi.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60E15BDAD1CB4.pdfIn PDF document text
    • http://sam-global.ch/files/file/66054675030.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd8e4dbb4---ritaser.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/34861711071.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/pekenoliveterajif.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hmfdl6gb4ttl0g8n6bsgouil65/gugegabitadedobafawibala.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/79783720238.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edef9643052---60213986623.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/kiterevuzegazovuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+print+avery+address+labels+from+excelPDF 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_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 16788 bytes
SHA-256: 8676277db96615e30f2869f82be12f1dcb2290cfe6be26e1cdd83d6e5067ffe0
font_01_sfnt_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 11280 bytes
SHA-256: d5b5bf3a6f49eb40ede3a6d82b7c6899a1ff3a970bc35994da7aa4bc220de8b9

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