Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb98c3cd24e782f7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 07:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 657ed1b27b71eb77dec248d41aba32d5 SHA-1: e17287b0cfdc248c559eae8cd25aad0c3af8308c SHA-256: fb98c3cd24e782f774b4f5ec4480ff800daa7075d396238a85319367d759e61b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b0af889b489db941f970cf7ea30173cc/5048306029.pdf In PDF document text
    • https://gyandeepjkss.org/userfiles/file/dagoxovaxopupobonuraje.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67746824714.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/26699440116.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcfb04fb9---juboxojalixogate.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e696d21f28---82299572427.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28007352522.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0g5r4s35urthm1oqdeda9m3e64/62089819571.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nawoxogugabitafiga.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8ed121bad7ed3b95c4931356e80c3a06/wukumofepimilivovij.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210705083310.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l7kf9jb26dj9uj7fqlvco3njb1/9614344971.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d3cf7bbc7---revej.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/tipezajilatoke.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c184d107c---28970197112.pdfIn PDF document text
    • http://taociren.com/upload/file/210828192654215127rjsyxea4a1u1.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/soxivin.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9b4e12804---65998237750.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4bfd67230d63644d4551c664e64cd346/lilawexulix.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/82478064904.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b9550ed6---zegexefekutad.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/fisafeworuxarij.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/81675930355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bible+concordance+king+james+version+pdfPDF 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_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 20340 bytes
SHA-256: a9c6fd4223215f210328e803dab05f5387c19c30bbf287b141b69c9df7831b53
font_01_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 11344 bytes
SHA-256: 4d83df82ef3f9748cd43660bfe271fce69b1aa8ad6102c75d033ac004e280333

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