Malicious PDF — malware analysis report

Static analysis result for SHA-256 72483c15805a9310…

MALICIOUS

PDF

98.1 KB Created: 2021-09-01 00:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 021ab5ac17f6b2cdfe9125f31d2c43f9 SHA-1: f0ffaa8b435c5461c2cb875571572caf180e94d9 SHA-256: 72483c15805a93105ed6566a7622aa107e7ef2bccd83f0aaf5f990894d261032
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ruvmv6tr790mjhhab5oo1c2upd/bisanalowamekezixifigog.pdf In PDF document text
    • http://geodez.com/pliki/file/168977840.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/19482590756.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/dt2lt9hrnim9d8h5ku8lidsija/66727650752.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/24494146321.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jixigokutonixu.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/45652915908.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af938d38ae---jitupexali.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/55363308592.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/47646875901.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/78511460702.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed988dd3a6---41017790467.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/terew.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922106c54b6---siruderomusovuza.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaf0778cd2---wefawikufogelonifabitaro.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/872f4a1c9af6292a5f5abf9d66583fae/pofop.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4009e9c8d9f6fffc7790b0c28d0eddd8/34577282041.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328dd781db---84840007937.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f006720320f---62759563002.pdfIn PDF document text
    • http://sgpeo.pl/users//file/83897574997.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be41ae23ce---89521106146.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f698857058a9195efe2bc0f40eecacf9/1126156501.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f1ea65a5293d4f40b97ebc1412bd7085/gezebunomifawetubek.pdfIn PDF document text
    • http://splogservice.ru/content/files/dilovozaviveregaxofuxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=constructive+meaning+in+bengaliPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 22792 bytes
SHA-256: b11224c6abc65d415e7466fd17861a2beb2d7689c447925ff2dfbec99a2e02ef
font_01_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 10912 bytes
SHA-256: ca6237cd6644164653fa5a5738c1ed0cbe4f13ffa68e18c56a8cd041d175da09
font_03_sfnt_off00014816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 16580 bytes
SHA-256: 3b0a6053ddd7eed0b475ce9f49a5686f07ed2dce6f392d6635e13da637f1d9bf

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