Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c8d51c7e2b8f51…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 05:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f95a50fd343ec67909be8de4148c9521 SHA-1: 2f101571371627a4cb16fb6b054bc91eed4837ae SHA-256: f5c8d51c7e2b8f51ed5ce0efcf0de734cb5b72d18eb86b4b91cc1845581f8cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://di-tech.kr/fckeditor/userfiles/file/10287545699.pdf In PDF document text
    • http://abwmarlboropike.com/uploads/files/31616629201.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/76aa49ae642624e8815a13fb8ada654f/79571982110.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/92665548501.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/wemejobukex.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/80179733920.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f65d4f5ab---durefenofulavuzubav.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/27121671387.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/13914073091.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/bukamog.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/91516067181.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/39754807850.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/15725765128.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/36825704889.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/61069640370.pdfIn PDF document text
    • https://grancom.by/upload/docs/juxopefoxuvazifixi.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/gajukafaxupalero.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/nejodabajunovituseziva.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ivdrdeabukbm3ger60ps6p1qn5/69906969626.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/mizevavu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070e7822f---basumibifa.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210906_15987E6512C64A13.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/9805299849.pdfIn PDF document text
    • https://inarsindbari.org/uploads/37007592709.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/70338646434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=football+matches+live+streaming+hdPDF 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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 11000 bytes
SHA-256: 5203d4218e7f137b3d65d8a576a2e2589fda05279a1ded613184536928b04450
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 17688 bytes
SHA-256: d77373df6fce966a0bb3dcf505fd2c8ac5b34d07ab9814cca739b41ac1db296d
font_02_sfnt_off000124d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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