Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb3acf7b2ae796b…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 03:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 068ca1a74f5b0e35e8a80b3a6472d516 SHA-1: 16d4d4875a46bd4a97aeb81942716156fe162168 SHA-256: 6bb3acf7b2ae796bd867da6d44c867304cc0993a4f5f2648385bf0907b5d4f40
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in one URL point towards a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=ps+i+love+you+quotes PDF link annotation
    • http://amghanoi.com/images/ckeditor/files/4940781350.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0500ab1a---ruvutezetokepuza.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/monuxunifavufoz.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/893a234d1b206ce693fcb96f89238c2c/83195672933.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tiderozetuliwezep.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gebase.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/37570524209.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197f4ea377---xakifalefipusim.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/64708028067.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/00e2a76923449d1dac37e48208a27aab/roxizepuleva.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17868aaf2---fewoxufavo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/tufifatizewifu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721125cb705---vamizalotaf.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/33869598f23bd3639a3ce06c907c9745/mogutojanesubujemoserepak.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/21990568562.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160946bf2b7f90---49021450408.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7aa9f0327---71084485303.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vd47mj2g55vailg6gofp2gl6n4/nuvatunijevunofi.pdfIn PDF document text
    • http://adveotec.com/img/file/vujuzewes.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/n0os09blnnqs295dg97b5arnn6/64783618139.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bajagugos.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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10160 bytes
SHA-256: 2c06e00126f1102f878aeb4d2c5a06f9183598903db544c8c2e626d644603ad6
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 17032 bytes
SHA-256: a11f4a69a879315aab3d582ad5854d3ca8e21caf424664ac67670d5f09a65b86

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