Malicious PDF — malware analysis report

Static analysis result for SHA-256 f522d88f49a3e071…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 04:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8ff342c6c67ee87c648e42ee91d3b01 SHA-1: dd12bb4c8afc6f590d487ee82a4353b506dde404 SHA-256: f522d88f49a3e071b35f1de1ad5ad7b42d11cb7f892f75b3e9e70c00d2f7092b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to other PDF files hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=skies+are+blue+quotes PDF link annotation
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/98780676782.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/nixuzumifobopovilebakuf.pdfIn PDF document text
    • https://scriptdd.com/_file/file/36169077052.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3067269e177455a16b1266f91326832d/nibepovepidibibuwave.pdfIn PDF document text
    • https://dineflon.com//files/nazilaguxiwatowu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a16ea4b1---wepek.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e51d25455---7865972318.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4d0623fmodbp60chgauh8dq9mc/retarajujovunozeguxezak.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/6743442286.pdfIn PDF document text
    • https://puppometalli.eu/file/zolamadotesaj.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02e986edd---20240956895.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/58205c8c482a512bba5afb64bb324911/18312315812.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/5945637520.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31d3768e4---wofuvojifegozafaxivep.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/76890770051.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nogasiwidujipituwolozejo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/51d7296ca9b7384e2f1a5df4823a2634/74358509751.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2eade52d---jawidokobijisimifelefigo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf6c3a3ea1---kinuvir.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f430c04064c3461e77f0192a7964e100/sasivaxokosawalizip.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e5bd81de06iniugknrfbtmk32p/lerojaruw.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0beb35bb---biwuvalafu.pdfIn PDF document text
    • 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_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 10548 bytes
SHA-256: 3a1999334f603ee5e7e4be86169a010cce127cd2d4bd7111170e653b0f39fb1c
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 18044 bytes
SHA-256: c8e91c8c99c6440a7ed9165180efbc4dbb8d421c4fef53b3b19e65a5fde9c65d
font_02_sfnt_off00013fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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