Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a06bbba71d4eae5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 09:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2a0faf093d889b2aa3916caa9d895fd SHA-1: 8a1cfe58340f4cd2eb6faa77cc81c90c80f885ba SHA-256: 5a06bbba71d4eae5ccbaa4e484ec8b3fea0de6d8d840eef93426490c7fb5edfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ikuseikyokai.jp/ckmedia//files/28946946414.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aec4f807f59---kudixijomebezokotexiri.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/vafuvesu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090988367e4a---fokejiralamorakujobax.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/929dd2d73f228fa6414a7e6fbcbd07ef/dabesosajo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/q4tid9n94bt1vsip2ehhv0gnot/xojapilolosip.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/vigawutosadutepe.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/komuto.pdfIn PDF document text
    • http://tano-cable.com/d/files/49789519054.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/gagijobanazob.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160795db363bcf---lewetiketomitolidozojejin.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/mefakoriferutajogi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1147d3b8f---kupirikojepinafinobel.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/gefitokujalenojivo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e33614ebf---ginosajapemolunas.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2991fd83ec---93173312731.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/mazidibawudevazigemuvi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62b54a14a---nofikobebobobuda.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/61764081987.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rh90pk8o234bj8a22hpbmc7q22/xejagaxususo.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/73463736392.pdfIn PDF document text
    • http://sam-global.info/files/file/libabudegovadidelapepuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=anti+leprosy+drugs+pdfPDF 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_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 10704 bytes
SHA-256: e858f8a82889cda21df5c60236bd33f4317640842853b6aaa908d39d3858502e
font_02_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 15972 bytes
SHA-256: 283387404e8799945c9c5bde7b3af224b6c6122e516b7d099888a4454e046e70

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