Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf38ce54c6e00e7…

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 03:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b2060076c4ba86a8261e3bbfbe79084 SHA-1: 563104cf696243107b0286151b40d653980a555c SHA-256: aaf38ce54c6e00e7be56d09a29564184bcc03a1096cbda16616be4fce75fe7ba
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a chain of links. The presence of JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ivelinabozilova.com/userfiles/file/3813280214.pdf In PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/46178945846.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/53274185728.pdfIn PDF document text
    • https://flyags.com/editorResources/file///41848495615.pdfIn PDF document text
    • http://master-br.ru/img/file/6242948349.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/bixupelirepaz.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/12263041184.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/kilebal.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/43058394610.pdfIn PDF document text
    • http://krzeptowski.pl/file/88774002135.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/6781441020.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/4288312034.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/zinasejuda.pdfIn PDF document text
    • https://seger.cz/userfiles/file/61950129674.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/bilakezobazoxewelaso.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/45734075685.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1dda35ef4c318808ae715db299224f8d/gozukorubepapev.pdfIn PDF document text
    • https://tsegypt.com/file/81181104327.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gaxubewotunixaturijive.pdfIn PDF document text
    • https://aokman-drive.com/d/files/86174085399.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4d13db13---migunoninogig.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/40e8ca1a6d89f06da2db3057e2d78a23/jajeriwuzitopuwiru.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/181c766a5a585b5aa24d5946e4d20052/98551735933.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/56858714883.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/fulilebulegumopeze.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/81476463273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+music+apps+for+android+indiaPDF 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_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 10888 bytes
SHA-256: 8c7b29dcbfb1bdebc12a9297df5831d70f6285828de0f3936f20413515490adb
font_01_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 17624 bytes
SHA-256: 1d7544cbf9249da5c39e4f86067808be3f872afc95d22d14aa3fe0c333a52839
font_02_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1