Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7ef0857b6ee23d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 15:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa33033d3df06f9db3060e3ac933a41a SHA-1: 973f88d3a83f236c4a99e1c9687a0abf3021af3f SHA-256: eb7ef0857b6ee23daf5de08e0bd01c407001598e7db2222949e83e13808d610c
164 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://laborke.ru/uplcv?utm_term=www+temple+run+game+download PDF link annotation
    • http://upservice.expert/admin/ckfinder/userfiles/files/dedidifalud.pdfIn PDF document text
    • https://kawanmto.net/contents/files/58984877763.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140af118260d---wopezomumuvifikejemix.pdfIn PDF document text
    • http://osayit.com/images/file/99378417433.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef638df0f---lofovinigamup.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fa900d9243a7156fb38abfdcc2bed3cb/bofaxixomidodaserugegiw.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/17766191716.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/dizukiw.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/95754964136.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_2BFD0499974FCE2E.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80153788745.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/laditovase.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kikiwase.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/70599622715.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/tuzid.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/61422152530.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/radiwit.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/digemizuwoku.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012be25c67---towitipasazetopubuwot.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/91834830729.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l3qod3bos7lcn5ir5fh5jf06c6/sugoxatigonoxuruvu.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56192037279.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914114751.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/nininubamoreris.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_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 17516 bytes
SHA-256: f8f360132be9c2694a3036a8590e5ec41b30abfecba3ea966bdbc01f065e22ab
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10656 bytes
SHA-256: 5f83fde0b67b6c8a3498f47e3facaf5e0771d0f2b0eab4f83b0038cc1bc8a0b8
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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