Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4edfe6e1cd23a5d…

MALICIOUS

PDF

78.9 KB Created: 2021-08-27 19:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86a424abfdbc7f1ba446c0b4c8efcd2a SHA-1: b28ef3c78313497dd577e098806fc99509993fe5 SHA-256: b4edfe6e1cd23a5dcda4214647ee9f773ca5c021c5836009b0a5ad2b2b4a8797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b938133bba04e2c77fc2678d38a86c39/bubifirukeb.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e9acc489d4625600eb7aaa908d8e1d5f/93621442100.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/ruvaloxeposuwivu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/494e55ad42279134f1904b0c7605de6f/wunilojupibudalul.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/wuripekodimobesozatud.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210818_B36D3B05EA0FB5ED.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9c4d5ee1239954187e2890eac52e6947/zewafujetevif.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aaa365bdb3---zonikumilonekabiwo.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/movaxodonuzudugavas.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xukefemivoguzodigoxo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/loxude.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/9237670049.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/tepik.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/92012447770.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/77334984975.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/17964754643.pdfIn PDF document text
    • http://e-district.org/userfiles/file/35124068967.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/dugobaxibodaneronek.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/libofuriguferalexojibanok.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/40597231719.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/75121518361.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/bivolinirexeriz.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/tekuvama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=global+exchange+remitPDF 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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 10788 bytes
SHA-256: 474fd67fbd814ad7a1b8e135a96f398aba8de413f4d5c03e06f2fbb319ef755f
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 18676 bytes
SHA-256: 9e5999722dae6f0e4afd5d8cbdc177f2d0532909783c28f520cd92119257e96e
font_02_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1