Malicious PDF — malware analysis report

Static analysis result for SHA-256 7630cfe018a078cd…

MALICIOUS

PDF

134.5 KB Created: 2021-09-01 22:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1a6b267601a6676fa42fc850bd58d17 SHA-1: 59a1e682f6cd1e5de567f48e3a0f635af9682cc7 SHA-256: 7630cfe018a078cd8eebaeb406688032c1851dbe41e83f06f05199d5dac73a92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161222b7dbc2e4---jufopazogasireloraxigugen.pdf In PDF document text
    • https://ketoandongnai.vn/upload/ck/files/zisifogepuvozexel.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884008f1d9---tamixo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff919f4023---konidigezope.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/lonagujilito.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/5855554426.pdfIn PDF document text
    • http://houselandia.ru/files/jalawukuzu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160776dd0531d1---vebosizeworal.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2774609cff1dda9e703f2629c44bf007/kosobojugareremogude.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79a94f442---66323950686.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083c37916750---wejafigusazakiguwi.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/puzirexitejafozop.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/vexidipabipotetiwubinose.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/zovebapasamagepuwodin.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a75c17aff---28367343163.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9846ac87d7---89081246974.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/74970166737.pdfIn PDF document text
    • http://cosyromania.com/media/file/zudex.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/ninov.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4ca5784eb---80374628394.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/43146540544.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/35192695692.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/pavokibifezolaralez.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/76568269456.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21841185cd6016e8f8c4d2d02e3120d5/64270032031.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/64888287524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=carving+drilling+milling+and+chiseling+are+all+examples+of+whatPDF 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_off00018bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E6 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0001b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9D5 11352 bytes
SHA-256: 80fbe32ce7724e06f5927708ddabcc3de39f0961e5c77d5844d2d4a7ee34b84b
font_03_sfnt_off0001d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D43A 21180 bytes
SHA-256: 6450a1585ac0b39b957a9c74066e8c57df24042269bbf9f5a018a37de56edcb9

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