Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4227183eb32b93…

MALICIOUS

PDF

87.3 KB Created: 2021-08-01 08:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 63d280722ef2af801d38ef59a575728c SHA-1: 5a7744e4d1ebe5ea110cfb9f0affb9d8a5af50be SHA-256: ba4227183eb32b939af3f70f72992c5dc343089781297c40f8abfa678084a576
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The primary function appears to be redirecting users to external sites, potentially for SEO spam or to serve further malicious content. The presence of multiple external URIs and the link farm structure suggest a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://medvor.ru/uplcv?utm_term=gangstar+new+orleans+mod+apk+unlimited+money+and+diamonds+2020 PDF link annotation
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/sivavigixo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6e3df60d781e70d39e1fcb014abc0d3b/7850364143.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ctcpt3gi6vqhra2f66nguss573/37657415319.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0527374707---44211292457.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/bo1nkffq54f2h87220hgfi76ms/xixowefaxokob.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/17924939439.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/bimizupezusewebemis.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/vitekatesevufunosuwebo.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/80372544020.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609a500043baf---fizenepanolepomosibipona.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd4bb7bee1977816d02c89ec3e05456/19716830.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db56c77de721845e845c907efdd9d638/78555235148.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/63904810477.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c4ae9fca16033a81dc9fcdf5be1875a5/xijemopile.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/siligedefi.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/19723455537.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa004a36c56---89723336503.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/wazasofurisoragafe.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16095a12c05043---79074853496.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/22737333391.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1bdf2cc80199a43cc12aadf55154072/pabotogazexibowamiliz.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/tebovid.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 11408 bytes
SHA-256: 30d07eebf36ffed1b3e0c9979763043399a91c38b1c58a8bd71d32af58285604
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 17740 bytes
SHA-256: 4aec600837784fac0a6ef0d8d15875aa98fbb2e65ae11f8aa986e4713d495b21

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