Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9233b3117e9bdc0…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 07:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c28f0a06ac4eed7fc890b3617efd4906 SHA-1: 2e6a970d6fb3cbe409bee3c4aa1296c98647bd15 SHA-256: e9233b3117e9bdc04b4012a3e23a122a0f9c076034cad4156c29e0f2570c627f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=how+do+i+save+my+photos+to+my+sd+card PDF link annotation
    • http://sozopolihills.com/userfiles/file/87480751650.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e68c09c4a8346e9b9d4f7e43046f16f5/sewasejeluvubowafo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1cd5bcde9989b08a4e9bdfd629a5ca56/98945992541.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140766541a08---jevepugotixizifova.pdfIn PDF document text
    • https://zhansq.cn/upload/file/67542908996.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2f64f43e4e07a6c088634154a1b9d2de/9304606575.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41c38505e---36839182915.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/34879508015.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/52870441461329ae5c0db5.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210914_46A082E6A8DF9B8E.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd65d375f8---fufapad.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/35881634683.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///22750073431.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/fotofuko.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/10560011621.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/mosajuluxodokamolidivav.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/tikoludumijo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hndo96iu85mit4kt23d8l6sij5/86942682176.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/gixexugeg.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///59917986666.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/nijalajeganamiw.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/65179073240.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/38674307057.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aebe387af---leruje.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/72483262263.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/68351858535.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_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 18632 bytes
SHA-256: 68a70f884d64d30b42b4c1b76cd5f8a688e8295ca9d7e7c342d6e04003ae458d
font_01_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B34 10888 bytes
SHA-256: 9330665187bcd1449dd408869fdf65a823f1b6543ba2b80d20e862a8af8eecd3

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