Malicious PDF — malware analysis report

Static analysis result for SHA-256 579214c9dce8078c…

MALICIOUS

PDF

96.3 KB Created: 2021-07-22 02:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 003d65de8dbd4e788aae782c8abc6f83 SHA-1: e36bca309be425e87ada120def7f3cb2e9f07847 SHA-256: 579214c9dce8078c236e919d02a3727c0898b519271f1cd434c167a1a51b88a1
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing lures. ClamAV detection and ML classification strongly indicate malicious intent. The presence of numerous links on potentially compromised infrastructure suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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.
  • 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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084c3b948b0e---19479588886.pdf In PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/kokisoroguxejaxenefuxuza.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceae5038a4---lexodeveforozadukududadow.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/tewaxivufozibubi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac9c8b15e---86120518885.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/r53je95ubb13m6u6n2026jv357/deloxubirinoputabebodovin.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/tarazakiresekexuzutuge.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b0891a8f---mowejumeluxeka.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/supowi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f392d61617---wojifuvozoxupatobubiderow.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/01c6af9f48ecf3f6706a1ed4c2641ad8/16614403469.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19b19838fb---83152093659.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/93495956015.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/gavajituwapifaxonixi.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/10052890800.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/71970234928.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/vodev.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/91032923217.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/28078654883.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f835a6aaf21---fabunaretez.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/gaos8vco4vfnraj001925ns9jq/98793611557.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/gunesexesufokifegawegufod.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/15f199ea82ef7ce2c74dac0b0d42e53f/80851640550.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1792cec69be32a1e37aff40135fcb01c/65674189607.pdfIn PDF document text
    • http://www.bandungmesin.com/file/lujofezulebexekenuvebo.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/likunojiluxumixod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wii+wup+installerPDF 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_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 19948 bytes
SHA-256: a2610bbe155dc520f7d6bed1d67a3a04fcab8062b8dea80b36e2b339e4ec105b
font_02_sfnt_off00013dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD8 8432 bytes
SHA-256: 05c799ceecaccef7815c2cdcd19d9a97d47f584c095e7a9d547bd985003b9b8c
font_03_sfnt_off00015aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEF 10304 bytes
SHA-256: a6a761d1565a0c3899f9dd2c41cb7d99ac9ec1b36199eb4c78c5598111337169