Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc93f0632984b04…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 14:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f28f3b520f9b7d164485d6fd7b1a014 SHA-1: 8b30c2e454cdbbf8d95529d9447ae2e833f42929 SHA-256: 8dc93f0632984b041d1b369deb4c0f8a475c2de680a23716b75aabe1b4ca5a25
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pataniforum.com/admin/jquery/ckfinder/userfiles/files/52547302078.pdf In PDF document text
    • http://chemonova.com/FCKeditor/file/37892939062.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/xinemufo.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/99583184659.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/ziwokevapoboj.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/50250731374.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e983ac7233---43632298519.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3081ae7c---41497020420.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/40838187852.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/15276180263.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/rakuxozokuzodisevo.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/turugatakefuro.pdfIn PDF document text
    • http://chayka-svg.ru/files/panizudepuxupuzebe.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/buwiwiluvituzevaze.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/buzeri.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/88734677887.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/davodebifabewawapomijarof.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/dexinapigezo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2dac7f884---zinexapedofajabegofiseda.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kalelukibivevu.pdfIn PDF document text
    • https://svltv.in/userfiles/files/51096051197.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/kotezikex.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/99323607605.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/81da7351ca31ed3ccaee4bdc604678b9/lexefatekukosepolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=prokaryotic+and+eukaryotic+microorganismsPDF link annotation
    • 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_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 10976 bytes
SHA-256: 2cb2663b28719a69d39d1defb10043cc5b7e89ab8185c9f310fb715edee450d3
font_02_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 17812 bytes
SHA-256: cda74dfd16973e42cca2f26cc1e53833ed06b5426c702b573c51a2a35a2085b1

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