Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a3045d6281a49d…

MALICIOUS

PDF

67.7 KB Created: 2021-09-16 22:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98f2781c9f043a0d12dd5f44a23de359 SHA-1: 78ced5f1e1874acad99d21024f7ed757e316ac8d SHA-256: 48a3045d6281a49d2fd377716b320828094cb09e1eeeca53b003a197df24504e
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting domains. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1c10aadddfe88e5da8ed50162733e4e9/newogugibodunejon.pdf
    • http://www.farmaciabergua.com/userfiles/files/94874456171.pdf
    • http://pescepiana.eu/userfiles/files/duzimubizuravukex.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/teligigeru.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/napevisovenubuj.pdf
    • http://bebsulmare.com/userfiles/files/tasidagadiluz.pdf
    • https://geya99.com/ckfinder/userfiles/files/15190235844.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6c76d0e89cebd4b1527800e38ab10b8/numovoromijefok.pdf
    • http://archpiudue.com/userfiles/files/39071614433.pdf
    • https://service-panev.com/userfiles/96553125188.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xomiburup.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f7s0a3e79fkcvft9o39pfg3h4l/25927288606.pdf
    • https://maria-galland.ru/files/file/dapufalaxavidaxeji.pdf
    • http://iehyun.com/editorupload/file/venovepefuvikobagoloruwi.pdf
    • http://ipai-bg.eu/img/file/mowetazod.pdf
    • https://saikekanglun.com/filespath/files/20210907030035.pdf
    • http://htwy.com/upload/file/gugixenekuzeloriwevav.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/79820315507.pdf
    • http://swatimishra.in/uploaded_files/userfiles/files/84871713012.pdf
    • http://balaton.varosom.hu/userfiles/files/vunar.pdf
    • http://gintaras.cz/userfiles/file/92724264258.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+studio+how+to+save+data
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD84 16792 bytes
font_01_sfnt_off0000c59b.bin
6508d698cc79dbcecfd171248bc3222279f573590c981c786a870b9ecaa50e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 10532 bytes
font_02_sfnt_off0000dda3.bin
3e0131756a577a28c9a888a73bf4027edd51e7b7c8ab8df371785da57dfe3798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 14540 bytes

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