Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c608461c0f02ae4…

MALICIOUS

PDF

75.2 KB Created: 2021-09-29 06:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b1500b8145afcbeec599fbe7055fcc0 SHA-1: 30683bf89a4c8503f0c05649c035ebbb3ae4915f SHA-256: 3c608461c0f02ae4e8f08e72361725fd962daf5967bdf62283f95ab3bfac264a
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or attempts to trick the user. The file contains numerous external URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibidari.pdf In PDF document text
    • https://nasikampung.info/contents/files/saxazufaxuxusawumexivo.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210928030405_gt4pw8.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/57177331640.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3614f9da---xuxinil.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/7900357739.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/fimetosodetivudibosez.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366f86441c2---37968274666.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/9546219526.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b4c41b3d0b8afe0c87a0776b9e2d60fd/85308953851.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/15231320722.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/88428435778.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/95929265881.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xovutopilasiludina.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/dijoref.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/46766036245.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/bejelabuxemoxaje.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4da2e141---vowamitovev.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/97425218250.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/lilesunoni.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ef12797a---legebox.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/tigevunezipolatugu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96405ba93---51420529111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=eliminar+anuncios+android+sin+rootPDF 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_off0000c069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 18004 bytes
SHA-256: 070423c69dc850195d37f13789f118de5f4244d51fd387ec49dd1ef71cf4d910
font_02_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 10480 bytes
SHA-256: 192d28a68fad1c154942db17e4ae796be65b348b530e8a1d7486684051251230

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