Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e6d021a1e9ccc3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 23:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06b17cc804e33c67d81dbfc869fd228e SHA-1: 5d76602a9708fd3f24b0b825ae5aac9f75aaed46 SHA-256: 18e6d021a1e9ccc3a9ef5590304f7034c71048026839a92a0a1f45b7d59068c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=guru+live+cricket+app PDF link annotation
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/82e3953a393f784c086bb438fb653da2/42669604779.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/jakunubaxajarilimegu.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73030177723.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210916_060038.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/42271296007.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/pexojebabumedolise.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/gememixozadugugirofidiwuk.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///xinezegasopomikujejulaz.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/091906387391.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/pafedajufawikuzugivove.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/69796935571.pdfIn PDF document text
    • https://ccskin.com/geektic/files/91368004848.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/24248864594.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94038144161.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/83763949971.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76fa3a73d---19454184066.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/sizoveleja.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/xamulegewiveko.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/46226571908.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/22459254258.pdfIn PDF document text
    • http://specialcats.nl/media/files/susemur.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rkpq1p7kre8agfsnrpdqqnuhu6/10347561091.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/79545654689.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141517c1506e---63024091551.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/77668028073.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/33813179982.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xevaxixo.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_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10272 bytes
SHA-256: bcf2088e9ac4583dd75fee7781890b7db240481b26f15df1d7e1e1416f147f9a
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 17264 bytes
SHA-256: b385560915343f642073c079b533118ab435189a317d452cf9324787fb2e3766

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