Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d51ee6978004ee4…

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 17:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c04760378d0c288729ff185c17ae19e SHA-1: d9a3c3069faad7420de88bcef9a31d00e15c4a62 SHA-256: 6d51ee6978004ee437557613ce3454b8ed1e100f57c71f91a1e23f37b6cea2d1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=how+to+breed+a+cow+minecraft PDF link annotation
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8d19ebcb---darazelexamika.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zoguzadiferabapizoxab.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7b50dca2d0e7ae58b6eeca9c704f10dd/wepojub.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea713c4ae6---tulutativabosej.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/metinifaxubokajetif.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2nc5c0952tbvlld5drrj2i6e33/vuvemafomiselana.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4f5c4fd2---54175731880.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021430648267319.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnqrdi0p0q6rf2slk4sq77pfh2/22440711156.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/kizaza.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160856dd07473e---53633924859.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5a76599d3---xiburamadujegodamu.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/nuropu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/razarika.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ecec9b29487ac98e564c761af7914219/kesadogiwipemefoxoliw.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/75663460448.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/59423020481.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3a85869f1a945233151bd911b3ad6c84/ripodoremedijewanuwovav.pdfIn PDF document text
    • http://premium-h.info/files/files/seponagogunonaguduvaw.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e553ddf1d---95530996698.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/29cf986882d93532d76672e000886438/mofusilonuvuremivezabiwap.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/83970443975.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/4502563192.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_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10640 bytes
SHA-256: 1f07353502084fca5e9fe39af0c817b51b26ea20c802c556f9df1d1cf321a053
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 17532 bytes
SHA-256: 22f1faa92c03a92e8b07b4ff2decfc06459bf66056ee9e6f075f4da4c1e20e0f
font_02_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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