Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43462ed5509d115…

MALICIOUS

PDF

116.8 KB Created: 2021-06-27 08:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 24805acac07604cc150f5e0885f5c83e SHA-1: c9586c9486849a1eb5863dc71533277bc0cbebd3 SHA-256: f43462ed5509d115397a74150ca0010719a218848b323772a6d955f4348495a6
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external URLs hosted on potentially compromised websites, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://aduanaldelvalle.com/userfiles/file/75977042753.pdf In PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087232540ea1---jovogepimibatenepebagej.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/evs4giuioc7n10ej1ahm13gnmq/47621914092.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/25121305502.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/77d4633bfab8a1f8eef3dc3ee2024553/kezezagozikutazonazosu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bc2930f01600c642530bb01ac10f58c/98879739205.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wenisavero.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-15/20210515040049366329.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/21783861011.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8a84471082a79f0871a7f7995bd08409/5580847611.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/380f75f82cc52d42a091f0077977b3d8/93732847388.pdfIn PDF document text
    • http://htwy.com/upload/file/muxegepidukebixapukobib.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/183c521e427376b78ee73476dfba43c2/rosomumonu.pdfIn PDF document text
    • http://prestopc.it/upload/file/vugomesinenexovafotum.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/48452183663.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/wujiwobadiso.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b8a0c68d---debibapirex.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b4f9e357---64285239695.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/369c65261a0ce9c481ed401e78569c2e/64285723930.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/97160034926.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607afab983a9b---93307480421.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae89b9e9e---33445360811.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/6957745158.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4fc274be---dofisalabazepurele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=came+up+toPDF 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_off00016381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16381 10036 bytes
SHA-256: 683d4f5ad6dc74c3d804530ec7ac014be04edc62a2c306ec9047a246ae14d714
font_01_sfnt_off000179d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000191e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191E9 20432 bytes
SHA-256: 6deb9b32ebc8ae93bafc605dc792fae488b014026c0c7df97088c44c91832418