Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd9ad552808e869…

MALICIOUS

PDF

90.2 KB Created: 2021-07-23 10:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc30d7549f67676348ddbbb6fea89bba SHA-1: 6549ca505502d4d18ed14c73758f10c4b69dc19d SHA-256: 4dd9ad552808e8690c73c474972689f4a046d734061be26f119471699ef9fd93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/911311280bd4489b0285d736bd3286bd/sojexexisiwugujigul.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/516b68474647aa10f99cb00882481771/61717439207.pdfIn PDF document text
    • http://www.polni.si/Images/files/wagujoxogezozekibemu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/20304999706.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/i2k97kir284gv28hlumkegd1bp/pajoxafubufakixetimoro.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/89d911ad928075a17363b4603eef5beb/gokafevibisedobuk.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a5066c3dd586535dbc534f756a1fcc3d/94590255380.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/68226357f37f64b0fabcb799bf4e34cd/63397793811.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a932f72fa2---58701914398.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/gipov.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/52979690142.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/31976743012.pdfIn PDF document text
    • https://chptravel.ir/data/file/58908554751.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/bubagabeb.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21b70fda7---45692175431.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/nafulevivudewavatizoru.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7802784d---pugejoxul.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/midukewoxaguzawipam.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/bobosabupafesag.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160791cfe70722---78134512206.pdfIn PDF document text
    • https://atrax.hr/files/fanabil.pdfIn PDF document text
    • http://charivne.info/images/file/bafominikeforunilidu.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/80467927568.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fbee17b1204b5596c8eb1ffad6b04ce/lebuzubopog.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/af9fb7d3e1aa75c2fcda8b190ebcd4a8/lekukivukilapoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=baptist+faith+and+message+study+guide+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_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16988 bytes
SHA-256: 4d4d19e91460cd627b1d3a5f0661f2c07a8bff701fae1aad35bca02305e02805
font_01_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10944 bytes
SHA-256: 76b63da261745fb89c9161e5f53ec6fb889b3c09ae9fd416faf095c6c233815b
font_02_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1