Malicious PDF — malware analysis report

Static analysis result for SHA-256 89331393b4e40456…

MALICIOUS

PDF

81.3 KB Created: 2021-10-05 14:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 184abd782a544693d01c85c9172c3367 SHA-1: 5c24deacdb9baefc1ebaf5f19af2c67d08bc603f SHA-256: 89331393b4e404569030ff2716517114730a0fa14309e6f19a790b262b9caae7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the document exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=mahabharat+serial+title+song+mp3+download PDF link annotation
    • https://giga-tronics.com/userfiles/files/60755344928.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/84851674122.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lidixare.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/51839771293.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/42327824037.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f737858dc9ee3fdd92c93efbd747ee0c/magewonepigebu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0c4224847d56b5fc5dd3090f3020ccdf/37725534791.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/77191239665.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/98159397130.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210914182623.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/fuviwoba.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/jatuzaposejudagagamekumek.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/59589600252.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/69287220826.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/mojexegojipitubazopixafa.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d44f80c94df46b6bb34302f54df0b12d/98802777184.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/96794077285.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jiloxir.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/sedesasuxagunar.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d231a8d15---9953302529.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb341105d4---95141873878.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_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 20672 bytes
SHA-256: 6f902e51051d78e7e377f4395af34eba23dd1b9fe17c2cf0d5820249af76fe8b
font_01_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 11232 bytes
SHA-256: db240170e63f984c9ef32de1c81d9eb6e7718da3bb28f463b3d409574d6ac8fc
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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