Malicious PDF — malware analysis report

Static analysis result for SHA-256 158a540c2ff9167e…

MALICIOUS

PDF

76.2 KB Created: 2021-06-22 23:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 80bdbe943dbc579d7e4305dfbfc02a29 SHA-1: 11e75e54c5f6f271f19a63550ab221a3c9f5208a SHA-256: 158a540c2ff9167e1640dda78e6ade12758832d4cf319ddf7da26eeff90e7c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/223db091d8d0f18f94a253e43df1f70c/39482002822.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/90575092260.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/nisifuza.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607631f53da4d---zefevisijazevobebipij.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/r184p43t4m5p3ubnk4rqencou5/fipotijodiso.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/tiwifozenowelitutadu.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/72772467856.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/15403362685.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/pelisonobun.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/pifiluwaxofazat.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/dprpvp8ungf4kdib8ar8eoic7l/fozukusazefal.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bf0585ec621cffcd13ef78b79b1f8b16/1497012825.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6km0linggsmpsmg3duebemcas1/nomaxojow.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bexok.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210620075906.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/364dbc59883faac7260dbb8eb3cc062c/95758578295.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/ponanefajoxanulaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=understanding+logic+gates+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 5312 bytes
SHA-256: 11e073e751c2f60803947f141c543b7e6e7d0ba56a43558e8767735bd5d6dac8
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 11024 bytes
SHA-256: d4691338de355ad8397701098356d8d620abcf2bce7f48c7741757cd387e1ec0

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