Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e9e1bc73a42a25…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 02:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e37addf6b513190e45ab5f13a8dc033 SHA-1: be80612788f4a100a4b2d035720cdf2bc86c568f SHA-256: 90e9e1bc73a42a25b1b09545f75605265be7fa10504c03533ca6b536b1a0bb4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+do+you+ss+on+snapchat+without+them+knowing
    • http://ytlcases.com/userfiles/file/dunumosoladarizironanu.pdf
    • http://orvositudasbazis.eu/images/upload/file/nojojabufadalajuka.pdf
    • http://bjxbw.cn/userfiles/file/durejafif.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/22092987009.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0fi8vbnrft971f9ioms02n6kbq/dejunaxejusosudare.pdf
    • http://tubemakingmachine.com/uploadfile/files/gitasaxalitogikegevegepe.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/96857343144.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca93801a36---duluzewifadixobafalixaw.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/gadukumelinidulelago.pdf
    • https://happy-playground.gr/uploads/_uploads/files/papid.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/23976718482.pdf
    • http://cardealer-space.com/js/upload/files/63956908477.pdf
    • http://pokewaveanaheim.com/uploads/files/83581882068.pdf
    • http://homeopathyhongkong.cn/files/95109685494.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f4ea33fd---netupekibelovukarovu.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae0e239a9---xalaxuvonujekonazewugiz.pdf
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/67729543617.pdf
    • https://bonekarusa.com/contents/files/ruzisag.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323e950e4ae---36192043672.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0ec201a4---34337024959.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/24550816628.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/nikefawuwebikufifarigok.pdf
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/kisegomijig.pdf
    • 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_off0000d7eb.bin
4c6929151aca4f10fdb2f589120a065d732d8182415265c67a141e168d05c0dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 11200 bytes
font_01_sfnt_off0000f1ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
font_02_sfnt_off000109e0.bin
b05352222637fc58083d5d3da77b1a2195f3507eb8ee7ed5385dee013f39609f
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 17632 bytes