Malicious PDF — malware analysis report

Static analysis result for SHA-256 988fcc5e6d800894…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 06:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 57b134896e46034909e6a91d7acdb132 SHA-1: 3d353481c4db919581b070dc068713a2d51a6129 SHA-256: 988fcc5e6d8008940a5612b95a7cb67cb6d6dfca94262fb30d0a761595b94943
164 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of multiple external links, some pointing to compromised CMS uploads. The heuristic 'SE_DOWNLOAD_BUTTON' suggests a call-to-action to download content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=antonyms+list+with+meaning+in+urdu+pdf PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e48ba9e85b0---53541243698.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/vuvanapokobilal.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/91483839146.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1df063b06---50913839667.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/88607570893.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/63f34e3c8df864a9b6c1d02f83a09b27/52665850018.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160883d99a28a2---59718377880.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/tanezipigojumukorizadiri.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/30127247993.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d987bcdac---86287740301.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/68302357062.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/rubaboxuwexi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/39ca38ce6998afdb511c5819dd004519/76525050622.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/welagexodedigemi.pdfIn PDF document text
    • http://northcity.rs/slike/files/pakowejaloxosuda.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e778a1f2a---10386466626.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef6aaea3e---fobesexatodup.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/08668caa383d8c1a98e549191ca4c152/kelijulapuravevisiw.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/15173606838.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0bb35bb75529274d8240c8a9c44bb296/16842582786.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/17484413656.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee349e2974---77773365808.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 19404 bytes
SHA-256: d4435ea3968240e72b030419040a48aa87976c84a2e965e25731afbcafe58071
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 11224 bytes
SHA-256: 32782c6d7ef740bca1d232df89492123a40ea96c72c75a6ee9e4fd5f9c1657cd

Open this report in the interactive analyzer, or submit your own file for analysis.