Malicious PDF — malware analysis report

Static analysis result for SHA-256 53decdcd3b31948d…

MALICIOUS

PDF

101.1 KB Created: 2021-06-27 21:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3d82b29ef22395462e26c9d01e864846 SHA-1: 5f43b82342d329ce459ef3312d8a19449587452f SHA-256: 53decdcd3b31948dcbf18775b64d885be60fdc73991c4ef25adc7870a2f9ae9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing unwanted software or extensions. Several URLs point to compromised CMS upload directories and disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ya-ke.cn/admin/upload/69659756274.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded91a4dad---darevafavizulibuled.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/740cdbf903e93c0b5c50bf80af1197ce/89094460655.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/gerapubum.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/33802555271.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b7cf82eed665d906284d66178ed5f1d7/luruf.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c1f81cbf145e9655c9ccd9669707d7ed/xuwaxutosoledusilug.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wigulelemufevosivegikefa.pdfIn PDF document text
    • http://tano-cable.com/d/files/4419936055.pdfIn PDF document text
    • http://billsky.ee/files/file/80688125551.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fecc3148---xuborupoge.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d53g96u0atuur3uoaahbl6gutn/64198681183.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/43260578315.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/turuwewudixazopafokepuw.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/o0um0k3gqbphkov789rnjqf3fm/zuzajub.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/83002743836.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mjekg2mvgdtd0e2j10ajk5u4n2/xikigaguzunido.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738b7acb11b---lekad.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a938ba154c---sugewifipomesazaf.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffcd2e9df2---menikuworizilo.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/nonaxiwufexelidakavowezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+hack+pubg+mobile+emulator+without+banPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 11064 bytes
SHA-256: f2b01bb2b5b6d34a8e12048a2efedeb9ca6cf3e016d441c0040bab9c6268f9e9
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 18212 bytes
SHA-256: 7df609db7d6b1ebda69e0fd6663c549359a4a66c2751e79e4412bde1e578654c
font_02_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 18332 bytes
SHA-256: 164c54f3f3a3336332d277ea871572b17817d17f875022cb927137a97c0f2216
font_03_sfnt_off00016cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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