Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed64586471aaa5…

MALICIOUS

PDF

96.1 KB Created: 2021-08-15 05:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 778593d6ac74acd0669ecf73a791d8dc SHA-1: 866c46897b26883f6db2179f1282f0d7a8f7211c SHA-256: 66ed64586471aaa59b36a7c4c2a7d13ea6d09a92398635f28fdb248cf54b1659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and a link farm indicates a likely spearphishing attachment vector, leading to client execution via exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://autodilykanka.cz/cmsimple/images/file/napewabada.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/stjjuals0shdo8ovtber1tcgg2/ligukilenadegezikalebeg.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74d42500d---63892602494.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e6844c23f2f---tezufodebuzaveje.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7745268a---tisarajajujojef.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160af86212d101---68699517076.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ba60c82473---lidukixawusutufosut.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da7e4983e---nerafobovufuvujim.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/veletanugemebitefixijuje.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/32103510088.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/sejapijufadef.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/5311916534.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/rixajaguwawuvopidipivo.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/57355817875.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/32358234322.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/459e16e66db4898f6ce036b3ce69e37a/59083754790.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/pafobibitojufababusegu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/r6hggn4j0u1sk9oj5a1vsl5bie/78483289318.pdfIn PDF document text
    • https://12waktu.com/contents//files/78908344763.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e88bd43fd---28559472188.pdfIn PDF document text
    • http://gewald.ru/content/Files/35637883667.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/tilozafawowirosadijawi.pdfIn PDF document text
    • http://erpos.sk/data/files/51412726706.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb44d00b---31291391688.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c985cec46e---27136525602.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/34823441040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=%C3%B6l%C3%A7me+ve+de%C4%9Ferlendirme+kpss+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular%C4%B1PDF 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_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 18732 bytes
SHA-256: 8267447e542bccad13a6003ddc71f3d6ef26f505fe903cf9eb30e3ae5c44e391
font_02_sfnt_off00015418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15418 11556 bytes
SHA-256: 556b2f79a935423d07622863e87c55c5cac961643b815c800b4db67afe83bcc7

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