Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d63e89984337621…

MALICIOUS

PDF

100.6 KB Created: 2021-07-14 06:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fdd90fee8a91126859d75515da9e6c7 SHA-1: 0cedd089b9f9b60c35abe8dafddfe97628c1219b SHA-256: 3d63e89984337621580a3f5f431293efd01528d9a9f570c2e9a03ee38e3568e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2aaa736ba---99536933474.pdf In PDF document text
    • http://autoklej.pl/app/webroot/media/files/16717554293.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/lajokawitaj.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8574f7eb---femolulosidaserunefujufof.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b995e81caa457392d919e956ae203f68/lamiladezomato.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d29fdf30a5d18c2ddd9c5775446c0562/pakusipir.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1ce71c72a3d1ad9a6abbdf11005c52f9/74910890366.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a151c8055a---63384340732.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/83947018381.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/fefuluwenirujanujosidari.pdfIn PDF document text
    • http://tfforming.ru/d/files/gifekefe.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7bbe6559bcbb92acedafde893a496aee/41875940667.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kh5l4frc7sujbovjidiln0vmbv/gafatonokaxufomixafaf.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a7a451beee0881c768c4978d0f0003ff/jodixipatopukozi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bace8e5db1416496b5f48abfad8be06c/viwejoziximudiretomaref.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/25858077723.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32451418b7---sepibuxem.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720d94e70d1---91861853403.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/30052904597.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/miwufelawez.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090077986baa---12695765037.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb678178d---bilukorobowejaxor.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xozasezolemux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jesus+answers+your+questionsPDF 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_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 17324 bytes
SHA-256: 1af48bef0e28a1957eeab00ecd5146b4b537a3d91daed590eae0e3a4d94dc304
font_02_sfnt_off00016d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D21 10492 bytes
SHA-256: 8654552eec876347138636693123448a7374c4f9ead96a0a5e63e75f32df8491

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