Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6649a7013a4c7c7…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 22:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fa23645e0026053598424c13e8cd2cb SHA-1: eb441ad6e6aeb65a41907bcd0818c81c14d6e05e SHA-256: b6649a7013a4c7c7197db98a2a168312a0c4b0ff55da5854e0b613468ece41b2
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 compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ketchas.ru/uplcv?utm_term=pdf+to+convert+in+excel PDF link annotation
    • http://stigstudiotecnico.it/userfiles/files/bofibijaxerofokuse.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/94698393233.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/25615273638.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/luditezonavidakemefelov.pdfIn PDF document text
    • http://hmed.vn/upload/files/sipadinigadow.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f24c2759---samumakivimisajoputume.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/34676844045.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/63916697767.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614241e13a0f5---77687837592.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/45969266289.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/95997176280.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///pipudizozomopukivebol.pdfIn PDF document text
    • https://aneri12.cz/res/file/sezuvad.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210913_9BA1E9C73E5D1983.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb9fadcaf---54059183397.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426cea3f05---65476684944.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/39607307847.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/kudorefiz.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/90420066604.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4010299461.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/63078878184.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/roloroxut.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/97966856302.pdfIn PDF document text
    • https://matrixx.lu/images/76016433148.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 10308 bytes
SHA-256: 67e232f0c1728cef742980b6087b7e6d768a0974a312f8c923c759ab0b04eac1
font_02_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 17520 bytes
SHA-256: e949da6121b7235ecc7a5bbc1bc754b6171d9f4be56d7bba4b4def753c1ba8ba
font_03_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 17296 bytes
SHA-256: 386a1b0be18827f99bb1c580e913ee7248a5a33f873d83d82bba0d60117bc64e

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