Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ffad3683bbe22b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7fc0ff05ca63e321a9800675dc36476 SHA-1: 610a71d10a0767904da3ea693a93c0b65d3700da SHA-256: 79ffad3683bbe22b9f2341735cd20adec0c906718ef39cf2097febcdff39b745
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external links, including those on compromised CMS uploads and disposable hosting, suggests a link farm designed to obscure the ultimate destination or to host phishing content. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=watch+bollywood+hollywood+online+free PDF link annotation
    • http://phdpecs.hu/userfiles/files/nuvorateguzesufines.pdfIn PDF document text
    • https://o-dance.com/upload/files/lisekuwimabeta.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/15979785955.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/xelapexibejifaralinepe.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/72341310371.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/vefamisudep.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/63215432149.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2c55f26e5bb633e04f7b4417fe95284f/61513669460.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/98847608841.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/napebexusodonoxokakew.pdfIn PDF document text
    • http://pololanna.com/user_img/files/33570583852.pdfIn PDF document text
    • http://rc-modeller.se/images/file///30238121496.pdfIn PDF document text
    • http://carszana.com/image/upload/File/63216554997.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/magulowuwalovovakedafudob.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ak72osc5prj1tinonkqnp8k9kf/bemexu.pdfIn PDF document text
    • http://getdol.com/page_data/file/35085386637.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/vigivilivagesurutu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/desosifowodixabijolutigi.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/59005428823.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/xogedudige.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/9171897891.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/74354312666.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/vesuwatabewazida.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/sabiv.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/dexufujemiropinolawilokuz.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134176766478---97087624127.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_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 10740 bytes
SHA-256: 1f10445e5b5fc68f0b1d684e0310aa03e2e791d1e5ab92b0729b7512ef5c7e0b
font_02_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 18160 bytes
SHA-256: 71135f435420630def27b0bcdb7c7be81b067ef2624a9331a2fcb87cc3cbfe0e

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