Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a4e402d037aedc…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 14:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a63c40337667f19d149c9df58f07ce3b SHA-1: a00e519f8426125e0de7fd33130035e2d39ab38a SHA-256: a9a4e402d037aedc2821627661c0b8a334b8c4718b0ae5288e862cdf1cbe6d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content hosted on these compromised 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 http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6b40690ae---tazixiruwadojelovevep.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/wigovofur.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/29800590000.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/51283778710.pdfIn PDF document text
    • https://ka-base.no/images_students/files/jibadopolipodadigalut.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/92851980010.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/noic9uae3juk8giotjn82b91j3/fugaluduxowamibemi.pdfIn PDF document text
    • http://metallpress.info/files/xosepiregeforetusudogur.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/lokix.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ed2878a---jididazumetiv.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/gozemijuvotop.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/tdavc13recucgj4gj0uo485vti/buzejuxufiko.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/nozesafined.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd0ce2dd5---6925945755.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/68244840155.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/makifumibatorobitasidobom.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8022ahc4ek8p20s4r9q11njh01/numoxuf.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/21154483364.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f2dbb6149be890132f4e097ff3ddfb1c/31043811367.pdfIn PDF document text
    • http://industrialdevices.in/uploads/jutusug.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612131bf623d3---33622926644.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/9433174991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=occupational+health+and+safety+act+ontario+2019+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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 11416 bytes
SHA-256: 08e238530d185f8ee0764539161eb9cca3d30b950a11a2ee92fb9846185e1f90
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 17752 bytes
SHA-256: 35ef1f6b80b8c515bde3a5f8e6b2a16ec56e8693ac333d0e2cfa5eb775f1ab06
font_02_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.