Malicious PDF — malware analysis report

Static analysis result for SHA-256 1355d6c075fb9df3…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 17:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cce5a1b660d2a81d6ee7f9bbcf638790 SHA-1: 17d4b51a6d3cf73a897ad3eb3e8009758e5f149c SHA-256: 1355d6c075fb9df350f04cb566bf98c27c089987b6a6c49f869a41d3e7b41efe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites, indicating a spearphishing attachment attack vector. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b63e1a3ab---20725541251.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a15694bbe62---sojuz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608722b36a0e1---72946933640.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/73324766053.pdfIn PDF document text
    • http://santeh.md/img/files/saxonuvodem.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/92545bc625ec06b5e2d9a7e6ae9f1ca7/66994350418.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d3d6638c---91967081324.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e110918c9---76628315038.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/sifunidiz.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/97149406688.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/62573203052.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/20169414130.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/84491722150.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/makixorubutorowodanol.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/20844011030.pdfIn PDF document text
    • http://come2menorca.com/images/file/dudiriwexefegixuk.pdfIn PDF document text
    • https://activepymes.com/pub/file/2358275506.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/99220738714.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/48665970067.pdfIn PDF document text
    • http://enricobarraco.com/files/roxixoraw.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/83588943495.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/wemabeloteb.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607402b94fde3---futorujodokubireluvamum.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j7h3skqtkflii7tubt53to78hl/69694085471.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/8385166395.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741d4e5dde3---luwug.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78598424047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ones+tens+hundred+thousand+chartPDF 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_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 16880 bytes
SHA-256: 83526dabe4577ff954a9f43dbabc137b9254610d8896a7033c7202c4a99008cc
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 10456 bytes
SHA-256: 118f108e1963456c9e231c895d927429c8ab3d2433695574406d8f32d29b7138
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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