Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaf22c5f9809da6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 00:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85074ffbf5f6b86ce13505ebbf2f5d85 SHA-1: e3f6e6507c9cf994768865dd8fde5c0d5bea44fb SHA-256: 6aaf22c5f9809da6e8eda7df0f7f7b335ba4b55ec46ae1c2039958e3c3f40af5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a malicious document designed to lure users to external sites.

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 https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4fccef0be---29070426351.pdf In PDF document text
    • http://zjlytl.com/images/upload/File/gidaduputagejoremok.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/939979180ca61a940aa5c3c018024e3c/notijolibaseditozonal.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/fiziw.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/q76mb5i2t8bg73qdtvvvsv5umr/76334601914.pdfIn PDF document text
    • https://cubic.is/userfiles/file/4036273341.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/73164634871.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/gimutupunomuvis.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7197d3bc---85394877673.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/43434894515.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/21662681090.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/30226721044.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/22837319862.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9bdd9c2f8eacb7bef76fe953296fbd56/56007974661.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/dutobupedajojinasovikirod.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/46292903961.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/18565665425.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9b08162228033b09bf1a0ae15113a62e/luxipivodol.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/97657691119.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fotalovawosudoda.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/nixav.pdfIn PDF document text
    • http://ladna.pl/user_images/file/raxusu.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/45715212900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=missing+addend+worksheets+for+kindergarten+pdfPDF 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_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 18516 bytes
SHA-256: 0ca49443e2b83e3c1eac687a628cb2170e5a36bf495c328d8fcc1c244c1b195a
font_01_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 10904 bytes
SHA-256: 8ecc668dfc5666336d811f91c8f0337dd593700150fa920bf733d02d96d91d54
font_02_sfnt_off00013ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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