Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fb68e55e719f2d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 14:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd04709cb9e3c80d35a3963040ab87b3 SHA-1: 87b723749953e178913636bebe376044913e790f SHA-256: b3fb68e55e719f2d3d5d1836da77dd64656a357552009305a96d73ca3d18d20e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tekdalyapi.com/upload/ckfinder/files/95629695697.pdf In PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/77717739260.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/25830714796.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7ca5250a1ab4951da18157a9262bd38e/44702466452.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/19b26689a0fe5960638bbfddcc66308f/14989167265.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i16ba5nrvar0p7sfvh1m9gj6k7/16254917459.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0d9a11bee---53159114760.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/h3hg508r5nqn3ihnng56n4lhl3/xigasizozepasofikonaf.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be4e4d2d2---dakipanumuba.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/xizir.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090bd65524ec---28178437650.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/kipir.pdfIn PDF document text
    • http://szpk.hu/_user/file/bubixobibajigepup.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210709150500394.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0j416hnlfbo6cjqul5jedhmot3/titetibolulujexumuragezi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b24d83692---80865424138.pdfIn PDF document text
    • https://led7.ru/file/7035953093.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/21852447158.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846fc5cbb31---91075314511.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/48238652108.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/rokitune.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/bq1febe54ffp330eov56fovo61/kotudubajakekevemo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/de3004b7b0c61dcf0255d533edf12db6/setatajimisiwopinilit.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/taxonamegajidonelexem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wagner+wide+shot+power+spray+painter+manualPDF link annotation
    • 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_off0000bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD18 18336 bytes
SHA-256: f714951bd974a94d42fdf6e0e6c5aacf340c1572e1cfbab81d0ef33e27506f6a
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 11132 bytes
SHA-256: 40999ba1b07fa44ac3cd000c8c571752707cb85de004427bf487ae16e0b444d7
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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