Malicious PDF — malware analysis report

Static analysis result for SHA-256 d095e28cd36ecbfe…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 05:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4cdfeedecc48f6a448aeae5674ae5600 SHA-1: dbae291635910bf9d1ba9ceb43a4e0b296639fbf SHA-256: d095e28cd36ecbfee281063eb8b82331ec47437a7416864c076d27fa268eaf62
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external sites, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://adasms.fr/userfiles/file/22143030751.pdf In PDF document text
    • http://bilmatbasim.com/userfiles/file/ritokonomube.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ceb385a58---vukajukizemilewit.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d9fdd61d5ab5313d0fde1fdfe83fd36d/19597766124.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ed334ceb401d85bbf995d0123e078da4/5787753655.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210524210931769.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb7e9fd8a---movulod.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b72e53de9---80684903586.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/35747451102.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608518044f2e2---62665520802.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/12985774325.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856e23d701---34467723330.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8ae70e3f---kositetadorumidemejew.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5110e70540---57437538631.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b9438e5d---kokeduzori.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/22329647556.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/93816113369.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef074ca182---dagukavot.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8bb490450e86097cb4d9bdfc20742da1/vesupujopezujokodezodiwis.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/23940055675.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/96234806903.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210610_25F231EF70C4CD62.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/megix.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/piporosezori.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b8c390ac713---956969976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=all+halo+answers+royale+highPDF 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_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 18332 bytes
SHA-256: f1e19ac3fad2b185b7184b8a29c741a4aaa5e66a7ed73f756a4e94023c2f98e0
font_01_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 10468 bytes
SHA-256: c3417e0676c2cd1047aefa677cb4058fb01c57b7b8b888ef923bb78a49fe8bbf
font_02_sfnt_off00014a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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