Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd281fce6b27ed13…

MALICIOUS

PDF

78.1 KB Created: 2021-08-16 21:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8aa20321724a1165e33278fa0ead4310 SHA-1: fd408fe20b7289dc422160e5336e88304273711f SHA-256: bd281fce6b27ed1384b44aa3245e1cdee1bbe563eced139029256d0c76b97b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=2006+harley+electra+glide+parts PDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c408e721a62a3c8735eda4b90ca64973/ximikenibamutilazinadoli.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/zorijusopubi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f086147c15---mepodagolixojurapop.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/57530057971.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/51cd0acd427964f0d83f84560402884e/44422241617.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/geriverufidovusa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ed526l09c7bukpa2vigtjr1ji6/tagafuwizurilesokigagutag.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/mebegujenobolexixogaguxov.pdfIn PDF document text
    • https://rintrans.com/files/78251946343.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a09c5b39b---82517662870.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/87773749115.pdfIn PDF document text
    • https://strechybenesov.cz/content/17765109370.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/27535124696.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/voraxumometivipamojela.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/retat.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/titulezopiwakifuru.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/girixujovifirida.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/mofazonukenegibobug.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/dabiseleweruxodagokudidoz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b2fefcf0---tazurej.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/navoxavavuzubedarixemu.pdfIn PDF document text
    • https://maclashoes.it/file/78950210920.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/28435825831.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d6e8520a96c9a65e3f523f07ac63fa0d/lojawufedunatuxetomuwi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0690932203---todoxojupafimaxuxakuk.pdfIn PDF document text
    • 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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 10996 bytes
SHA-256: 2c6e93860140b7eca11469998fb4656513af262b1c4eb1caa43f72cbd15438a6
font_02_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 16740 bytes
SHA-256: 49871dd9e146f6c36223cef27649cba02e9831685b2075e5495d64fd5bb48310

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