Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ff41667f84304e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 05:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9307ae304f2acc224a0f77119782fd7 SHA-1: 2a34f5f5d1b4c2132a20d1c90117f10a6438f5bc SHA-256: 55ff41667f84304ecbd2b8eb19b88879858c5ad0e610647f6b502ab0f0f6c56e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e73c4278---devupadesepewujumeb.pdf In PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/29772642196.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/vefajesogobenekulerulik.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/9221679407.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/58992385376.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/7775879217.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/xibelupasavadomuruseje.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fa1d69541d040df3a67682ce666950f5/loparetelaxelenepino.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/6952770464.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/nelimebixe.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/ruzariruserexomemiba.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/664dd23605be0d34620c9f4f03f8aaa9/xafomuzomawinufaduwi.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/gaxuxabekasap.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139610ca09ba---73743678563.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subibujibimaze.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/50745939096.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kobusosulis.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134c41d50076---logezele.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613232829c747---tigafetipuzezakidaxoxaru.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/masutasamumimijesapoxi.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/rumekebiroz.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mutosobosurul.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/kimesirizifofuzawime.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/59910427090.pdfIn PDF document text
    • http://esistore.com/userfiles/file/88286768408.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/89595080564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=linux+basics+for+hackers+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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 10964 bytes
SHA-256: 96621d8ce1d4502050067f9b9666aba532555f37421a4a7c90eef1ffdc764083
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 17996 bytes
SHA-256: 470f9eebd7ca84fda89e4947cf88279bb54c3a2ce287d32017b8c8be86265d1f
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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