Malicious PDF — malware analysis report

Static analysis result for SHA-256 64482d5613a33c71…

MALICIOUS

PDF

90.0 KB Created: 2021-07-01 22:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4d38ba05d28006738feb07b438730d7 SHA-1: 71c0dc7ce41e85f180924fa638e2ae1ff1852786 SHA-256: 64482d5613a33c71dfd6ea3d5fa7016b5093be5cd709aa8cf302d53c4f316987
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The document functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious destinations for phishing or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://fly.no1-yes.com/userfiles/file/42549213129.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a442c3f22d8---devemevoxinejaduvajepu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210620144352109.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/fepewujiwobebo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/73ab1dca9cdde5208f5381b906bcf401/fifiredevebafep.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608653bed71c9---fupuwakilevefen.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/63105181754.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/lotitukejamojeg.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2b4d238592b44e10f4c4f349beaa24e6/99461846422.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/70635507571.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/66692698707.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/66435858974.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd772a8ebf---75001138616.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/widanubu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb1bb5c95---rebidevapofafedegefa.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90f797fed---lelugisiranetuvo.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/sugaba.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b041cc0ed21---dudumopolew.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bb247464626---58504128805.pdfIn PDF document text
    • http://adveotec.com/img/file/texokuzibexowoguvow.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/14dad9d12e3bfb3f88a7c311e91eb8e8/megesenase.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93df50dd2---wararetiniwiroropotusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+quotes+for+one+month+anniversaryPDF link annotation
    • http://www.w3.org/1999/02In 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_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 10912 bytes
SHA-256: b0c7a47efcaa9d4c0eb5acb598687b318695d32cb5a5b0c3e8a7551fa339c74a
font_01_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 18168 bytes
SHA-256: c3957d8157cfaf72b94bb575af50f94cfdbe9775c9c825cc45b2439d57b51192
font_02_sfnt_off00014937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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