Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf69eadbee6eda5…

MALICIOUS

PDF

83.0 KB Created: 2021-08-09 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2239826686b61fb24b4c6af3ac381b3c SHA-1: bfa34d76cbccd05bafb1f18594304dde2fccb2c5 SHA-256: ddf69eadbee6eda543d82a7d649da96ab0a5c06ce8375d407f262a0fc79b1366
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 0.9974

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1348bfaea72bc9c7b0d7aafb0a4ab2fd/8693540072.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075120e3d09e---bopuzizekose.pdfIn PDF document text
    • http://22743333.com/userfiles/files/10614440451.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/652diohac0cbiog29f8h4llta1/7614018915.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/rawuwigig.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b02dd0b9b---31176750418.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kederogiwitojanipojag.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e703c301---ponawijirade.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/bewusodet.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3l521bnbqm5q8crkfhba0ud07a/pepimelebiga.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ij25ps8b1vhjsqm0vnlp31idl2/74072671062.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/39384149878.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kagadamejexunemuse.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e14505a8bb4429ff22dbb5464fca73ef/jazudemekazibedujujafefo.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/1626180204873357183.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/rofufipeluluj.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/97657339490.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/wavutumizebaxatuxoburuk.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e12b4e42---45960556592.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/55489708197.pdfIn PDF document text
    • http://pi-consulting.ch/download/83140032474.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c8d82f9d---90711668597.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/77845039019.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/getebigotav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=miro+clash+royale+mod+apk+download+uptodownPDF 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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 16352 bytes
SHA-256: 6b8dce14fdad2022304b6bb6d7051da68190aa0bd97f34eeac558d177554a878
font_01_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 11164 bytes
SHA-256: 8ddc13c25ff05c97707a73ff98a377b1013de228f04aacae968b87e71bb8bb4d
font_02_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1