Malicious PDF — malware analysis report

Static analysis result for SHA-256 0853e5f4f8cff902…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 13:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 593ec691dca99b02f1ebcc6b3cf5a6eb SHA-1: dc813d16845062a98962689a3bba2321132b5de6 SHA-256: 0853e5f4f8cff9027945e30c02e6f9573af911bf15c9d5db7784d7472bdd398d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm, likely intended to host phishing pages or distribute malware. No scripts were extracted, but the presence of multiple external links suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tinhdaurosa.com/Images_upload/files/dijukuvusim.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/xadokilalewupo.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/vidikonikefurezudevujur.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/55525395950.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/11163169703.pdfIn PDF document text
    • http://proetcontra.hu/userfiles/file/burezuxuwabegi.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/mojurabumemuxiravom.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/45235115698.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/66283663220.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/md7ie79lvicko7t81qgt162ngp/wifufefefavakilidapepon.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610021677fe14---kexuroxifo.pdfIn PDF document text
    • http://12shio5.com/contents//files/depuxijonokuxetemupifipol.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-31/20210831183034504631.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210602_0FE75D7EB1A051CF.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pilotazumuwudokusugoso.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/47980818909.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/soxesagogotok.pdfIn PDF document text
    • http://askort.pl/Upload/file/lepexuzumuzik.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608425d3696fd---sozebewuluwebimafon.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/puximusowopabu.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/lijuvu.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/superaretiwizefalubaz.pdfIn PDF document text
    • http://stl-hk.net/userfiles/15431244663.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202108241019168497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vaporesso+zero+pod+manualPDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 10492 bytes
SHA-256: 76755917a8109a6ddcb917bfb4ebf46806e74f845757cdea041b4c1616e1cf8c
font_02_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 17496 bytes
SHA-256: 92b197991589c0bd5b4d84e929b0c75cbd17cdbe539faf1419de9e49145d92a0

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