Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c7d058edc78356…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 09:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78c91ec28a268e4080b83c757b4c6871 SHA-1: eda4b524b5bf073434d20535eb74ea335f36be1f SHA-256: 11c7d058edc783569efc4f185b579f53b3668b9345dbbd64e5f808e22d325963
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=manga+man+android PDF link annotation
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/lujitazigeporulu.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/74325092420.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/95937657301.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/zajinorotusuv.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/gugokibuzapigu.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/dajogenef.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420b9c02ac3.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xajujojotegidorufumatafi.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/falosupejamod.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/37625029775.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907190349.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/73079041148.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/51826392403.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/73501673386.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e7a2e4c3---kazakeganefipofamekefibit.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161460a4043c0d---vukisupudekezebav.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/13153450033.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90559dc46---16737406724.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/6920556450.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/25226455993.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161353c7d0f83f---47605115313.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/pawojemowinozuvotifepuk.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/soxelifij.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/31398325475.pdfIn PDF document text
    • https://beltamas.by/content/Files/52718386596.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_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17240 bytes
SHA-256: c7e502cca5222d2c0315c7f9e775003f53633ef69c93364769d2f657f29b33b7
font_01_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13926 10140 bytes
SHA-256: 56219456915932ac73641188026df8fdd7baac2d9acea685ab51cfc8fffba7ba