Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6e2b1355deba76…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 19:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f17df12b0d4704aa0324cd8c592b4f6 SHA-1: d3c9edeaa447e53dd0110ec96cd253806ee4e417 SHA-256: 8a6e2b1355deba76ace200475e8b6cb532efff2d020913d55890bf43d4a91ce5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pixomot.ru/uplcv?utm_term=robux+promo+codes+2021+list PDF link annotation
    • http://dzbnf.com/upload/file///22141087840.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-20/20210920002859736964.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/vasuwinuwegid.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161347ff65f9d5---porabokakido.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jadizubute.pdfIn PDF document text
    • https://empresa-venta.hr/files/37226428134.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/46161236968.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d0f139508b5bca72c46cfa2e371c5221/koxalamatomuveg.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/63387561585.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/83807880690.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/tidujade.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/60006366740.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/sawoluxapalavifu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6cdf29b9---37521557040.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/91520964124.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/revizoli.pdfIn PDF document text
    • http://askort.pl/Upload/file/kabenoruxinefozovabemalun.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/86992383654.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pumivotimalaxerizu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wagimonuleje.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21659154860.pdfIn PDF document text
    • https://ka-base.no/images_students/files/rilaweri.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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 11092 bytes
SHA-256: 2b14fc591f80a640f2286b95f6979ba8b7654abaa76abc522a65480d109b2807
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 17916 bytes
SHA-256: 69a71c8ee73e4db56df4489dafb21d1ed899271efa9e0e9e14a771688e432fe8

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