Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd310ed8e64eddd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 22:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8bcd1c3614920e003bcdd381143cb1e SHA-1: 50f142725bea178674fe00a588d9e133bfaaf2d0 SHA-256: 7dd310ed8e64eddd272f002784e3534a754994cbac564bf737606055475e3b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=tamil+movies+online+watch+free+websites+list PDF link annotation
    • http://sowa-architekci.pl/userfiles/files/43558403926.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3l8ktlitc5rnr8eptltpkadg14/kilupokabidiro.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/33556617419.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613c77ecab07d---watazomiwobivesalidul.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/gepizemumevivuzosuxiluf.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/luvetetexafigagonadiw.pdfIn PDF document text
    • https://penal-garazh.ru/files/16834940883.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/r17il56173eah1mm3e76g8p0n0/zolimulovapikanitipomemod.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/mujovejewuxuzanimizuzufir.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b3f93073306db314c662bcca4d7b873/35711970594.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/78666504143.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/13607764833.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/digosaj.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/32021162159.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/23655188599.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/tumilovepuserunofajal.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/towoxukujutenabojedewiku.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/kutev.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sibegewozakufa.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/18266125133.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/pofib.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/fikivirilusoguwagaguvo.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/zujexapudexafogajobupevig.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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 10856 bytes
SHA-256: 32f5e8eb4bb4ed4aef25bd9750fc65041a6da31deba88029db5e11079fac92dc
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 17188 bytes
SHA-256: 28ecbe7d652f092380805ab18be01fef99a1a5c8fee6fe50f07ab405861136e5