Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34782ec9e9351b0…

MALICIOUS

PDF

90.2 KB Created: 2021-07-07 00:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2d4cbba58d3ff7aef9bbc9fb2e8a8569 SHA-1: 92d4f32b6df4874f8d3d1d982e7af90c9b0acecd SHA-256: d34782ec9e9351b0cfc2322577559915174bbcc622e0fd61907274e380596ddb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc26631f0fa---jizixedejadobikile.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa2a5fef1---93466169638.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9b771b3eeb86665440ae3e14b5011e4b/84131110604.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796c5e2feb8---kivexojovom.pdfIn PDF document text
    • https://artbynela.com/uploads/file/fifelekesifipozomodi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/55362ef5e457312ad3ab163fddb9aca5/bapuribagafadiseviba.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/46317017304.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p49266297p742p2sakle5vtg50/49550086233.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/8983946871.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nolakude.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/53632122818.pdfIn PDF document text
    • https://wonkingchina.com/d/files/fimofomoleluk.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bupazusapad.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/kokigivogaxifigul.pdfIn PDF document text
    • http://didula.com/img/file/45892746597.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e2b0502646f9e1349c1d717fd813ad8d/soterekibasotavokogobi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e1019a53ee397fd0f5d7e38ff6d99418/73621922850.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xedusesulejukitufavomut.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/wefanidupali.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864832aa9fc---48379376587.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dejir.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b2d85de9b1d534009fe57f1a2fcee667/nejibi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f840fdb445b6b8e41efbbf3d5099dfc1/76774816961.pdfIn PDF document text
    • http://mega.kz/media/upload/files/89356709477.pdfIn PDF document text
    • http://aweibel.com/Photo/file/morenegibopimelekisube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=modals+exercises+with+answers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 10896 bytes
SHA-256: b333720555e69ea7c372c99208926ba21bb1b8c68bf84138c69bf8ca13fb1670
font_01_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 16980 bytes
SHA-256: 202617c0d8747d1c0c8cae8457e11f9c306552dda8681e14bf6c9315452ae30e
font_02_sfnt_off000141fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1