Malicious PDF — malware analysis report

Static analysis result for SHA-256 366a2c7c532ceca5…

MALICIOUS

PDF

72.8 KB Created: 2021-10-02 16:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 842af014438fdc0eac1f02116436f9f1 SHA-1: 31e3bbe66ebc2a8142764794a816e1d708e9cfa3 SHA-256: 366a2c7c532ceca5ee6bceab656d14f978ef02352b966534b2539bbfa53ea0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, with many embedded URLs directing to potentially compromised or disposable hosting sites. The presence of multiple PDF link farm indicators suggests an attempt to distribute traffic or host malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://ylplj.com/ckfinder/userfiles/files/37417402295.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0a789396b8522a104d14d5ebfc25bbfc/96044094802.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/32523331788.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/30465722690.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/18573976748.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/titegujavutudak.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/vemolexavuvesefe.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/40768322565.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/sogodenonajukediguwoxil.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/26624705074.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/48185756564.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/84853338432.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/tenelufixakukavewerolufar.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/5648270416.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/doxezu.pdfIn PDF document text
    • https://vleek.com/uploads/files/tutarajelikumose.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148dcbef0859---darewavinoralofuzalodoso.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/26867708361.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab8e1576d966d851394a35993d5f465b/81616791203.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a836416---megasigakufuzaxanunaja.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/46661723888.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/97840170788.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/vitoravas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=enlarged+prostate+impotencePDF 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_off0000b648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 18060 bytes
SHA-256: a7a7c2fe50c41a1a2ce6d8f039e4aeb32f2736646f0af67ef2551be1f18058f5
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10840 bytes
SHA-256: 4281fdc4dab8be8b4cfa1003415a168432bdb466d63aff8d0e51db196bb29513

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