Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbede0ddef8923a…

MALICIOUS

PDF

109.2 KB Created: 2021-07-22 02:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e83d36b66ce26b4b89d822c259b3a20 SHA-1: 3b00bf1cf43cc8b65590518010d832f2b0dc0313 SHA-256: bfbede0ddef8923aa368b1aabd834f9b97b0e48cd98e5d866b6ab5addf912256
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/zebepimifezu.pdf In PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9ca63fa15eb6cda674a01722a4b52494/47052830317.pdfIn PDF document text
    • http://soupworld.de/upload/file/miwodirivisazobi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r8af0c22442c2998u9ik4s86k2/nogufuzojuzereke.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/pofote.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/joligi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609123d6792e5---54203267248.pdfIn PDF document text
    • http://progetec.org/userfiles/files/desenutavisodezifirirona.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/11723270085.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c4c43dd---fominivimisoni.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/43624894689.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/gubeviwafusojujoko.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/28531021771.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/73a2fd249f3762101b61a7cc8151ed90/sozekexilegumudetew.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pr0hr32ttb0lbk5dliu6u1idbb/28495053671.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da8c82b0793---44741072935.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f844596bef357843ecabf08f57c58439/69079486208.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/617aa6b3e17294ff003312f16f497d03/57451655602.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/27543454427.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ekg92u16mv4huu6org6o6ltmi2/dozoje.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/9625594318.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b441d41ef1e---valujiwalixowabemezexade.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073edbf4ff28---fofazegawutupopeja.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/tilezeneriwobodudaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pricing+strategy+definition+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_off0001466b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466B 10864 bytes
SHA-256: a46ccba44799322eaadf3bc0ea03865b0993e4b4a2eb365ae86727292b153154
font_01_sfnt_off00015f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F78 18264 bytes
SHA-256: 82f27640686c021e6cbf3499349046d7927d9ad37cc47b69b10d083e97f471b8
font_02_sfnt_off00018f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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