Malicious PDF — malware analysis report

Static analysis result for SHA-256 54228e9a8aade6d6…

MALICIOUS

PDF

95.4 KB Created: 2021-09-07 22:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8192313c2033b11fefc79a7a2c99cb1d SHA-1: dde9681965d938f9322159928f49828688546e9c SHA-256: 54228e9a8aade6d68b2721c535fd16bd35467b41bf8954e0da249a118c03b7ef
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.biogreeno.com/cms/ckfinder/userfiles/files/novetemupe.pdf In PDF document text
    • https://paidionresearch.com/userfiles/files/lodirabe.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b127f1c4---wopirez.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-25/20210625200944776264.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/amq5b4i72h31jrcn6a7t23t5v2/3056470383.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111bffa0719a---ragilebabupisinovipol.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20d685043---51268460134.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ut3976lnse2rv96djejcp2nu65/perabemebuvilisud.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1dad0553222f415aedcf62e544d319d/sipujirezixujogoxepexe.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/588sabugbshjnv9nj8mdbh7610/tavawidagotopofeziz.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/turazejigukofolumigi.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/rizofumimojapajad.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/bamewine.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/lowami.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108301714364475.pdfIn PDF document text
    • http://accronline.com/userfiles/file/7634234461.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/romerobesorisenutijof.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/37462539870.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/85938514538.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b70895d1268c0668a1e89df76f8d934f/vogise.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/36dnimihrs70fnb41nd9ql478f/kesanobo.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/69246601827.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/sixikopejag.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/35052946836.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/fepog.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/tapotazoralirupapuwilud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tnpsc+maths+syllabus+in+tamil+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 10852 bytes
SHA-256: 9b15ddc13f32ed7135ee03f843dad5d73b77ea06c69f0ab66ac4a50bacebe78c
font_01_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 21552 bytes
SHA-256: 2bcb602e498fda8baaf0987f91332a6c4e2bac9894a49991f7ead2834d91d993
font_02_sfnt_off00014137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14137 16256 bytes
SHA-256: 8012ec8602f853e1832512ab3fc112b22bc052bd12ab557362ef412dd0560f53
font_03_sfnt_off00015747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1