Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f47b4b64723529…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 01:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e622d161d530fcf82c58224d62771ca SHA-1: 941af534dde417be2ad6cee4abb3a7cd47c0b2ca SHA-256: 52f47b4b64723529625ba0416db00dbefda9e0706cbfd0aca513288bc671508a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns point to a common tactic of using deceptive links to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=how+to+send+pdf+larger+than+25mb PDF link annotation
    • http://thicongdiennuocmiennam.com/uploads/files/kazulokijuwosugelegu.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/6304841148.pdfIn PDF document text
    • http://novafish.it/userfiles/files/93336804874.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/lirovekebumedupu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9a7686a177c47bc93a63a3e026d4d949/gifefebesefokirafizoposu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee50651a0f---somivizofukegonuz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd00befd---pagisufa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc769fdfb8b---remipazupumodomuf.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/10138489638.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f39f563bf4fc1641f8323c585929f6fe/1505560802.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/37452907295.pdfIn PDF document text
    • https://12shio3.com/contents/files/6147931918.pdfIn PDF document text
    • http://aqcons.vn/upload/files/76031417581.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f56e518c3f3---dumugixilobaz.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/26715621429.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/junixaxowumekadubudi.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/kituwolodixupuwi.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/fomapixomogubimana.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/55ef6051256705031cb171c3e5de2192/rasikopizugaz.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/riveserelirir.pdfIn PDF document text
    • http://edgecs.net/documents/6735281442.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7048d38c---zipodabeno.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/48158334305.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/tamusumeresanimubite.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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16800 bytes
SHA-256: 520cb7799dcb5b249d9cae5102e9551732449c954961d3ba2d43dadd29be95dc
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 11324 bytes
SHA-256: aed5d68f2e5f292056ba9d7433dc8632dbbeb476b2bd67dada6551fb382678e8
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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