Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c401d30c4b5daa…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 06:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fbcddf36524c5df5c6f1f8cd9b5677a SHA-1: 49d0f9a4ce8250994f141fa81e40cb87396ee045 SHA-256: 18c401d30c4b5daa82f039fc21369e706a11020f40d505b95478a45f5fcfe7e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to exploit users through deceptive content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf3dbd67f---boteba.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4dad0aa9351f860663a3d3b0f779f2db/47514384138.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600876d143---pivadimifovi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/18568559512.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/32112970816.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/63635487240.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2570876a0---bijobusufemogumifuforate.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/silelizopajarumagida.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/14949579407.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb68ceb7d---8875853217.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d229d4325d8610b52b0d3e2a8da629cf/26944122774.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/38909851096.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/78923538211.pdfIn PDF document text
    • http://fructusartis.com/i/File/85012214863.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/10d96ddd614c6db3afd450c24df5f338/24767908081.pdfIn PDF document text
    • http://ciskmv.com/css/file/petufuvobopisejil.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096da7ea112b---87438450134.pdfIn PDF document text
    • http://greenglobepms.com/uploads/27807307485.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/94621774221.pdfIn PDF document text
    • https://csodamalom.hu/files/files/tikigamuvama.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/68104177552.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f92de041---powitaxeperaridelijutalo.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/31283584214.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1a99a9d1---feket.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/47886989530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ssc+scholarship+result+2018+jessore+board+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_off0000bab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB9 17636 bytes
SHA-256: a1b1456d35856b428df0ef668c535c28094032c29cf65334d615a364e6c59870
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 11560 bytes
SHA-256: ebb0a3b26800acec24639ab90ae647b9a5aaf2d39ec367ba89d32c08c0141ceb

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