Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e8e209a17f6d0c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 03:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f155720ad7bed6422aced39483f5cebc SHA-1: 0f7e0dde9ab30fd3b9ea8babccef8f4ac965f10c SHA-256: 87e8e209a17f6d0c664c9ea4d7c33d557667035cea4db9304023307a4936ecf4
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=difference+between+behaviorism+and+cognitivism+pdf PDF link annotation
    • https://mysilo.com/upload/ckfinder/files/18107312877.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4f3a7be9b3cf82340048584aeab4b68d/75709662403.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/zetakabadububudefarimafa.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/49354914923.pdfIn PDF document text
    • https://ecoretras.com/file/jumiralanosawosuwo.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/witodew.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/mijuvedusezovobefedemuvu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/df05aea12517b5a0f40410791a4a49a4/10693646435.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/97904153373.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/bumulipivewimavelib.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/jivutelujurexalobawe.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/pezejovuwawudadadad.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3cd3265d---lebinirokupigufitesa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0ede29t9c2m3pmfn5tsmp5ng2/74395780165.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4985d60b---zesevodawidirow.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607638ac4c730---29127435615.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wofaripamugevifevixu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607506f247709---fodaduminazujapawiwubixob.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fb0932bd---xetojivevedasijuxoremikab.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/51fb1e4fd29dc67f0bb7b4cc6fdeeb9c/zitolekevumimajukefixusu.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/4618981249.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/xezexu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/kematavekuvilosesed.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16114f95f56f19---59548924539.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/65668631834.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8733f38bdd---lokug.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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 11312 bytes
SHA-256: aad7fedfc7e24bbb27580130ad7d87402751d8773e85a808228cf4ec61002c2f
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 18600 bytes
SHA-256: 86a55bd810c1556a877683b169e5930dcfb33f1224c704a436f907020045f50e

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