Malicious PDF — malware analysis report

Static analysis result for SHA-256 7217fa091d0321a4…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 23:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eb6c3297ace1537435ad12df6fb2ccc8 SHA-1: 7260fc8bf7ee642299d4beeb90d909b91d10698e SHA-256: 7217fa091d0321a4f399e05c07893c2a0f36214fedb7253b22c2db505f8db35a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a compromised CMS upload. The embedded URLs point to various PDF files hosted on potentially compromised or untrusted domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lutitakutem.pdf In PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/79423465762.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/9123180969.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/7c38c6a99362ffdf5f2b95b96f6f58d3/97114576201.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/sedabusudef.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a0b577b55a3c7690756987f93df6e59/buxitisu.pdfIn PDF document text
    • http://farashimirooz.com/files/kuvaruf.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134032545890---73478396361.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/zojuj.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/61805700892.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/manosazedujeki.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/62039863239.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/vapusakinebinoviludajor.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/63094828623.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613859199bda9---7725649103.pdfIn PDF document text
    • https://5uempat.com/contents/files/suwenor.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31028274895.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/37223008136.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/36778237245.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///57371898811.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/9925348588.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/wurufajuwufudikawagapaj.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/75489108600.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/33058837220.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef593f9285e7b105ce05383cf35075db/13822038054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gaana+app+download+apkPDF 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_off0000b106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 10012 bytes
SHA-256: 07a08a3c7dc5b61e0e62f96df8a804be787c7dfd94b81817ea4f47cfc76e4750
font_01_sfnt_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 14404 bytes
SHA-256: eb2e36721dfe2d95fb267009d32d2ffa9290700b2dc9c4196a658f865449ed21