Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9b294ac34a48a8…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 22:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8f95af959e25b8cc166dc66df57fb21 SHA-1: a7c4d590f4cedc1a8aa7e68ccc49d2c97b597194 SHA-256: 0e9b294ac34a48a8bb152fd660a62b80466c767e5126dd9638ca798b9e56915a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=hisense+tv+manual+canada PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5pdclcjoeqktbunv6sba7jm938/wasukajesewebezen.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5c0d08093691b678233db4ab2c1bb905.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609843c901949---jefixezebepugisagile.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/xazejolagaxusejuk.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9032642b33ca10d49f1fde5beafac197/tosuzepukazerowe.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/50566535212.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/93748960665.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28c3e8fb3---90115110798.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f046ed2289cfb9609807f8f602190ba1/4259364609.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/3029850651.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/93413348474.pdfIn PDF document text
    • https://room12shio4.com/contents//files/zepetajajedep.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/19275695729.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/aa98e2b2a23978e52b0b04562a6baec6/zorosuvoxikijabutelix.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7a90006e1f0f54e9da14f9c32f89fcdf/2502776916.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085800f71138---68524345454.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e35d3e59---9698419728.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/87588456626.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/sogepomonarosamozobubejit.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xakuja.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/goteforidanu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df6712874eab71cb0ebb3d06219ea97c/21557972076.pdfIn PDF document text
    • 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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10468 bytes
SHA-256: 5d49dda7d207d7ec99327f3f0f75c6d8c410b3fbcc06c16282e1b31cd442137b
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 18800 bytes
SHA-256: d149791bafda4a98b808dbe2cdaba6cd4db45f2294e9666d53db57b9dfcd1926
font_02_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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