Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6e9e733c0bdc75…

MALICIOUS

PDF

90.2 KB Created: 2021-08-17 23:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ee2cc0e3ca9a8efc83f7341dccc2b06 SHA-1: b8e203e6f8c5b532548260a7a3642fe9ba1ee3ea SHA-256: 8d6e9e733c0bdc752b53cea201a89fe02372c0f7243399abbd3083f0bab918af
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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=irony+examples+in+harrison+bergeron PDF link annotation
    • http://irvinenott.co.uk/ckfinder/userfiles/files/fisigenukunomudabulatij.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/57846478422.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/17351782676.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071355542c37---dezosofogekerepiwuwujo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/079fcc5508e95bc398d7b9b65e342e8c/92230426475.pdfIn PDF document text
    • http://dnepropress.net/files/file/lekitulix.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/27115476765.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/tubavadokug.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4b9si38l6pk4325mfq4oouf86/86182627242.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/95079366661.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/86c2e086b2bf2f84f7a795609de46dee/65619914375.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/raguvotukevejovopigo.pdfIn PDF document text
    • http://orem.mn/uploads/files/18244849111.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c994b5f8e8---puvabavabelifewugefexi.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/83446697463.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c038b14ec76---nuwugonuvuvufabedoposaka.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/84da42d900c714a20aef67d119797956/lusukekujoridefaremonevix.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/60561874963.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608265d79efc2---65645005293.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4f5dfd11---20359222883.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/34252891307.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/92615077913.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/62133240257.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/pegelesikod.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fqt5vhkvc3r3apt61hcp1dh6p0/badad.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0be4bc9c8---jipewogib.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_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 17116 bytes
SHA-256: de2ce54f997f1b9d395fb357416b1c3c4437ae5dbd4d7dff7777638f061dcd5e
font_01_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 10908 bytes
SHA-256: 3c752242c12f61d8f168c0bfc500e2afba76ed5007160cc8e90d92812a9efe24
font_02_sfnt_off000140f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1