Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b75fcaf3afd45a7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 12:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d28282e43174b0f495f61ad8d8704332 SHA-1: e37189bb4d732446884c3d9017ed7a538dda5e6e SHA-256: 8b75fcaf3afd45a761f9705600a4479f385839dece23b2f343455e165b12b28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to malicious sites. ClamAV and an ML classifier identified this PDF as malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's intended to exploit users via embedded links, potentially leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=pinball+emulator+android PDF link annotation
    • http://antasboru.com/guvennet/resimlerfiles/57533491708.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/bafidunibagikesupedonafik.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/60650328548.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/lomufuruxifoku.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/51969489941.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905105128.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaede7e316---21091948067.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/015281648bf6cc69e84c6a8130359fd8/temezoxagenela.pdfIn PDF document text
    • https://agros.net/uploads/file/wijuxemodotatab.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/vabisosuvupusikoduf.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/norofujomusaw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dj4gjcduk3a3irfqmo9fqcio61/59675628405.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/dasukazerigamoponinetas.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/66454158130.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/mimajuvimatumuze.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/fewefonifim.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/dozezilumebiko.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614197d8e28b7---39628008352.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/73977618982.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/13763229368.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/denunutuza.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/wakusovazinowififemipeg.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/rumitomaler.pdfIn PDF document text
    • http://c-six.it/userfiles/files/xemazebulogijajerewog.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/48879116289.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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 10480 bytes
SHA-256: 67d17cd60db76d87320fb60e94b3b5f65fe44b0adc053b7bbf775d7664cdb0ad
font_01_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 18588 bytes
SHA-256: 299c6de540b5d23156392b8c9e0c8127b570874a202753a060962a814978340e
font_02_sfnt_off00012d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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