Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3da3170b0019550…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 05:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4795f0faa39c0f9fd1814292cfb3d56f SHA-1: 317d87c04a4da779a23074e8fa3e28048b317cdc SHA-256: b3da3170b00195500570f0a991c32c4506d0a83cf1061526fa14b29f79e52302
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous extracted URLs, many hosted on compromised WordPress sites or disposable domains, indicate a phishing or link farm attack pattern. The file's purpose is likely to redirect users to malicious websites for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=phonak+roger+touchscreen+manual PDF link annotation
    • https://himalayanthailand.com/image/upload/File/xuzasututodapilaxanew.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a790253426---xedowikobadapuse.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xetadedib.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///40503301413.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0b1bc9febebbdd057d0d2353956efaae/mubawizakobogatefutel.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/berabiwuluwenidez.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/romusuxupabogefadu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3dd50834b563f5739a57de76453e90d8/45863776315.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899d0773fe9---91345402741.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b8b70191b3d42ff07ad75815439a6cf6/venaw.pdfIn PDF document text
    • https://irantruck.ir/data/file/89627433270.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/xugurizexisowo.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/novezurezopumorepi.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4da039f5b23bf5c05c61b7e3f0cb4e77/88528201649.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d7da8a42---zudiduvarebavokovegon.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/grehqhnhi04agl3gfrbq6gjaup/8527297834.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c1477c7d9---zafisemakimufogapepi.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/rezeduji.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/84036073511.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/gojozaxufajo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/8122131138.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/fafiritesubukages.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/16139854546.pdfIn PDF document text
    • http://www.andreapondika.cz/file/vapuzulikune.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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 10776 bytes
SHA-256: 11e8b3464ce95453c335839b4dba59694287581c436ed7c80ae4947bbb1611cd
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 18208 bytes
SHA-256: b0a5f83a2cb5b369d29f61652f21d05ad82a4556a959f15c38ab6af49f62f44e

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