Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b2498497b9542d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 19:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 289e17af9c5a9d56eb3dd7ca21564a33 SHA-1: c205a5834e44d579d1440363f0c15ca2ef0410b5 SHA-256: d5b2498497b9542dc2d5cb0d93ea641a5c3d1e40ae967d180a377cc486246100
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=manually+restore+itunes+iphone+backup PDF link annotation
    • http://ladyqueen.it/userfiles/files/jutejibusudefinenozoguni.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/9811986847.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jefufitozinipirulidusobo.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/sukixugosajiv.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/kuvelinukekopusirixaxit.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/91505521309.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/gefejemunixuvale.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/83646970506.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/jebomimuwutininixetap.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/40385572153.pdfIn PDF document text
    • https://digireg.lu/upload/kixepolipumixajava.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e61cbc8cbcf6214e787e7c0f0f582d27/bawatomabowezavunonotaz.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/penobaf.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613395fa2b8ca---nudomemunifuwujute.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/loruxadubigijuwi.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/38816622385.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/88112319027.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0e898aafc0d665770e5ac6f4eb0b584a/12631186563.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/lusurefijumil.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zoxilugatapana.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/dasinadefetaliwori.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/22065389627.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/texatoratebikute.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/xiliwekubebulug.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/rowunuzebowilinuvurumeji.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 17908 bytes
SHA-256: 897ba64905094337a1e6cfea4508dce8ced8e60297b06635c1b74d80db1523dd
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 10908 bytes
SHA-256: 94175676c08783d43879df9d12e1be300111ad1001a2573a6c3992e4299a0fbe

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