Malicious PDF — malware analysis report

Static analysis result for SHA-256 8797190cccff827d…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 04:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e12205782ab90161dc948df68bed93ec SHA-1: f7d88b1d5c7e066a8c64f1f056f0dbf9fa293d4e SHA-256: 8797190cccff827dc58d4124e9b05dce66cb86b8b0ad5f414062e7254433f27c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://makanbanyak.net/contents/files/14880884112.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/13560287681.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/55498342888.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/14840493470.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/t3520an55meuqqr0j1jksunics/togebivemugep.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eb8c8fbf0684721673c8d7e69155eeb4/5981065072.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/1000393111.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/12024210732.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d20603bef---90491359276.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/383100edb3ded4002e6bb8d57de01196/wejepegijazixakezirudeva.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4e1f547a848003c50d6c62035e71bb38/37596980937.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610910d6d0952---suwixafoxuwexaxedodol.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b80268969---68297104642.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ruqisi8nsmgt7jdmet1vpm48n0/80774473449.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/90236535823.pdfIn PDF document text
    • http://royalgroup.at/tmp/vupaxomozawojamubudodanim.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c6f313d8---zivanaparifagurubafuriva.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e30c6e0d6a---39317822240.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/56436079359.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/50eebb8e46fc71d17fdcd332c064bc7d/16808232164.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f34735b1750d4e48acfdefc7cecbf09b/jezabobezafirijipabujan.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/d5kpu203cfs832efcr2lc5pns1/90443199417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=el+abc+del+derecho+civil+peruano+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_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10740 bytes
SHA-256: 2fc9ba1acc329b35c85e2fef2001a45ffa3088f43a180ce15c6b1489e733be0d
font_01_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 19412 bytes
SHA-256: 8db3216a15dab4fc6f2d1b842025e8c69922cf4543f2b9adb33c4f832673ae2b
font_02_sfnt_off00014226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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