Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f242bbbfe80dd8b…

MALICIOUS

PDF

89.9 KB Created: 2021-09-13 14:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85afb781024b2ce4fdd64912f7fcff85 SHA-1: 0219a337773cb8ccb7478e5917fe9aa674a8057b SHA-256: 6f242bbbfe80dd8b52657005d3235e7401779f131376bc6486d9094bc641e83c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=best+app+to+stream+pc+games+to+android PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aun1nbfhv72p2nnhvdopl2ocv1/nitivowusevuxapuditer.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18abaf40b---11550371740.pdfIn PDF document text
    • http://ymmicro.com/files/files/65892173545.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/53901233332.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109050751295875.pdfIn PDF document text
    • https://harmony.im/userfiles/file/65179457476.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/jeresosiseno.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/32221651245.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b667f03cc---80393937213.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/gajibuguxusiladupurixipe.pdfIn PDF document text
    • https://endobible.com/userfiles/file/17497122775.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/9493628733.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/dagamubutinajevunis.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/xepol.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bakofozagoj.pdfIn PDF document text
    • https://ayurmitra.com/files/file/logutuzirajoramolumuba.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/vugofuweratalalutajufumix.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/wisefatusavinesaselimovef.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/fezuxuz.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/mokefosumozerif.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/banejisofijomigereniloroj.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bigarakuwikabolaw.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/77015193554.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/67775866735.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/degotukadujuxizoguxit.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/53704164761.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/sedonaluroxuzekozabu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0661b223c749ec710630a315de2c8b19/juzeserefurijuwelebetare.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_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10864 bytes
SHA-256: 421c98de81ef3a6467004dc356019105c119f01539c010c6fba975dd0379e929
font_01_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 17976 bytes
SHA-256: 8f4104cbb39316baf2eabaf34d0ab6edc4ac1a768361fbc2c64cc11359124f72
font_02_sfnt_off00014128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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