Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c5c4638c0aeb19…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 02:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24f9c8f30370610f345eecc5e79dfac2 SHA-1: 3e4f0f9b58d3f510957df387eb087797a744eb58 SHA-256: f6c5c4638c0aeb19a29c5e1dbd2ae839735c4e8c4e304bf649e11541b052c4a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

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.salac.cz/ckfinder/userfiles/files/32534489090.pdf In PDF document text
    • http://aygroupmuh.com/image/files/35221537650.pdfIn PDF document text
    • http://vuason.vn/upload/files/gusezawuvinuve.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/luriko.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/nedivoporutirumeravik.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/22995023259.pdfIn PDF document text
    • http://health-bridge.in/upload/file/wuxafaporaturipe.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631946910.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e390d0c877---73841209894.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/tomugavum.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/99033875261.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/mupagi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/30784329787.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/47328930289.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dtj81fp2acaa5qinp4c0h5ggde/43817151533.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0316b2c7e2fe07a3bdb0a2854a991cce/gefidonozipefa.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3eb4d8dd---xedilefabanajudev.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/43953228925.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614671843754c---9850712440.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/zidabofanobifavonukesero.pdfIn PDF document text
    • https://ms1oke.com/contents/files/pitovupiruridizamozeba.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/27829220286.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/godapaxe.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/gusunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=malayalam+free+pdf+booksPDF 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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 10704 bytes
SHA-256: 41356139ed5702460825f9c99906f054555b8802d387aa423e1476f880527d3e
font_02_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 18848 bytes
SHA-256: 633e692629e830e808b59d7f81520a56e51477178e8a7874e182932f7e932f6f

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