Malicious PDF — malware analysis report

Static analysis result for SHA-256 60fd7e261e15a06f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9cce1902ad2578bc53207fdd3cc4ad4 SHA-1: 5244f7bdf2829e1d57a8f363a8e5cc435e9a54b1 SHA-256: 60fd7e261e15a06f54ba3f83a5ca5c6aa8c385f28bf05b3a058b17ef6577bdd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. These elements strongly suggest a phishing or redirection scheme, likely intended to lead users to malicious content or further stages of an attack. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://karatenarrewarren.com.au/ckfinder/userfiles/files/wavunifurokumetopuwub.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hbhonphi93o8ipe4f73mukcek4/piteworuvidozuwoxilotuso.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608af432cf789---jevupulimamaluzu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7tvog6a7dpv7pjea8tpj4ctue1/lomivuvekitavurole.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078278aeb043---86861643486.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6d7jplkfd18mehjf8dqpu25o45/nakofekufita.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b9b0914c---48147438880.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fe8a80---31203841866.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/79588246731.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/mabug.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/69063683975.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7712741e3---48001438055.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f060078ec9---webudivame.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/24593732635.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/36832202932.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/15863418522.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4c16f38badb039e310ce44e7d5cbd7f2/23671638136.pdfIn PDF document text
    • https://jin-ji.com/upload/files/tarusatapus.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec638c80b---rixeragujipejabim.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/63626165318.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/27369959925.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/rowiporivedawarab.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/86380715715.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75fdaba3d---78511431104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fountas+and+pinnell+50+word+list+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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 10908 bytes
SHA-256: 99ca375a76de73ca15d05484af48bd9dd48a0a39d5ea2478b54bea848bb8f6d6
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 18160 bytes
SHA-256: 1bfedebb48486cd3914f944ec41a6e4e4730ea16e8ef845f26173184d91b4fcc

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