Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d02c94213df83d5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 00:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3721a2f271dba8270a76b28b555933e0 SHA-1: 3ba4a5287dc69405bc884d94322b9f4f1184f26a SHA-256: 1d02c94213df83d54243d7fef1f5ad23e5d4ad2d0902fc4493e7076f1dd273ae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/76288911221.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752a4b75309---52077780454.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075919da676e---23329890355.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/93520610174.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/tosovaxuregisul.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/20535614548.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/72799787950.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bccc4853---7974177909.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/kejopenugenav.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qnjaib38c8hf02enmngjd71mjg/47883326001.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/52364462464.pdfIn PDF document text
    • http://mousike.it/img_ins/files/22657935181.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4183c111711427c674d69edf1f1193c7/jolajabunejoxozulatene.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b55d0c7f---gabulepagedobefud.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b246e59ce---zapezawul.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/50810611497.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/8341059929.pdfIn PDF document text
    • https://peterdegendt.be/file/17270780713.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c804eddfb123370d9bb4ae6ed85ec537/supadusikurokuxakotidel.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/71958194975.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zevatiliwokotuzu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161063cb2a3e78---sazojefemudevotuger.pdfIn PDF document text
    • http://mousike.it/img_ins/files/zegufafaridizoweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sistemas+de+informa%C3%A7%C3%A3o+em+sa%C3%BAde+resumo+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_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 11368 bytes
SHA-256: dd533423026acb786f75d38f4abed4cf521002aad2f2da02bc14507e0a5628a3
font_02_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 17256 bytes
SHA-256: a1f95efd252091fe1873a9c57ac8a2159187926a764d46cc5afd2f5e758eb6bc

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