Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9825a4b1b4ee830…

MALICIOUS

PDF

119.6 KB Created: 2021-08-26 03:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: de24b9fd911b3c8bc72c948face8df58 SHA-1: e551479ca9c80c958da6914f8832daf9429238dc SHA-256: a9825a4b1b4ee830581ab8fc3259730df7a9e1257cfacc6e35fc321a1e719dc0
156 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a likely attempt to redirect users to malicious sites. The PDF structure and embedded links suggest it's part of a phishing campaign, potentially using spearphishing attachments to deliver this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fe34b88d9e29f25988ec158c28d7768b/befobuzurivonusana.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e9b11e227---53463466772.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/68263d9ebb18a4770e6a59a60f40cd00/24457104039.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ebba0942---4910237120.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/nupanimiduzazolomavakamo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9de387b82---sinamadozojeremufabit.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/nimuruwavenexinu.pdfIn PDF document text
    • https://stvorki.ru/files/file/10575266086.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1b683a1e86a10703daf90a6bc1e88eeb/78452335160.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097405c5e0c8---83297542703.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/134de1709dd511dd67d3c5de111f855f/vilaxuwuwasobupaxoxe.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/64245621512.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/uau25vjivmuv2p072q1eqtvk66/96894001240.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ee3e36c58---nodijora.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sekivose.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc0b3d9ad---lejotapa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/710ff8f535c5fe2ad0228e2d0c5e6e45/zixixezav.pdfIn PDF document text
    • https://blugarden.eu/file/vonubagigimifine.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16082751299b28---24787718689.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/panugimizibopexiramenizu.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/43332596755.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/gixegidedozakurizafebi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/ketoxovirunurojekaxajuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reaching+and+teaching+students+in+poverty+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_off00016cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000184db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184DB 11180 bytes
SHA-256: 179373158594452a83cbcc61b2e2a2543fa001be78a51fe4aeeb40d1acf89b2f
font_02_sfnt_off00019ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EC8 18276 bytes
SHA-256: 23cc487b9199c658cf16b41d82c04f8e852c14775ecc16c4899cb5b53ab2729b

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