Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faef2feac812564…

MALICIOUS

PDF

100.7 KB Created: 2021-06-13 18:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d2c5d4f903577769833fdce6b79f0bc7 SHA-1: a7de94ddc8c8515ce6f7c0d9e5d82a158afa3801 SHA-256: 3faef2feac8125649ae4649ac534d596672f3c09eb7c67b0ef913f66843572d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. While no scripts were explicitly extracted, the overall structure and heuristics point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://infrive.ru/uplcv?utm_term=lord+of+the+rings+2+torrent+download PDF link annotation
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdd16beb7---93681070943.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/xowubufobubaveboxofedewo.pdfIn PDF document text
    • http://jngf.cn/files/file/92869874661.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/84574046231.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/67500844560.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a54a4993979---8743577857.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d157e3ed8---sowabisirudomipilutiro.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vhl246s98hd83v3e71ibap7ek2/88910089540.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590c8d55fd---wokutumenofojipe.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b6b36d3e7348c51ef653db500a0313dd/ridadofigazoruvefoxuba.pdfIn PDF document text
    • https://stopserv.ru/files/file/zisoxomaxiwufas.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/97488080979.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b602cd344d9---kotifijitojepidolejikodog.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b2530ac---kevuketud.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/gewajexujoviw.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c92laj2sn8g0sj6s365ngl5uc2/88828990775.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/460ff2a15b1bfab3ab0e2c8f436f244b/watifitijatezuva.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92509ac57d---40808795735.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/23340986046.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b961f1bc460---72325271732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 6704 bytes
SHA-256: ea3612b44a3f72079cee8d7fdda92815df6113b5538fa7db289141659193077a
font_01_sfnt_off00013202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13202 5336 bytes
SHA-256: 6957305c5263b859e086bae09edf1df5e5d33e8954d3702103a271aaaca0c892
font_02_sfnt_off0001443c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443C 11912 bytes
SHA-256: 53214967ee73a2b789dd51716fe5db7429a364d17dcf5b1514fed975ae984232
font_03_sfnt_off00016c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C78 16344 bytes
SHA-256: a8da9c292665632a9909c515181c94ba131d9e814f5bd71875576a3ed8aa5d1c

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