Malicious PDF — malware analysis report

Static analysis result for SHA-256 798743367482bad6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 02:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92d77e70b03465ef73845411b807a27a SHA-1: e7a6fe426c214f37f352b78560f552e7bd915f20 SHA-256: 798743367482bad6fa61e793032463e7be3e89988809a24f3a4b59ae93cd001e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2c18660b---rogezikakanibale.pdf In PDF document text
    • https://syntellect.ru/Repository/file/xikoxuxaxali.pdfIn PDF document text
    • http://surtek.biz/image/files/20150401_000754.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/fomikepugevonojo.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/nubidasedelofo.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210912_021253_2248.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/49362020652.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/gugevosoxiredovusegij.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/99599961008.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/rubimuxeduzumize.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/gaxujig.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/9009606529.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/jinaduvibitizibebofekave.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_230809.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109050534038947.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/22027309694.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gazoxevinivixof.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ca9ae87b8c0bc2de808178c08eb647b7/vovixomu.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/61013967998.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/pebewo.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/koxonifudimipozidavaxub.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/58595840827.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401fe662cfe---xewoxetusirodosite.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///60665272711.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/gimusigelilosudu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/livagibixopili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=como+optimizar+mi+android+para+juegosPDF link annotation
    • 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_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 19660 bytes
SHA-256: 431c23c2ed86e5277323512488674120e496b71f5dd3c4c5168b973b646794f7
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 11012 bytes
SHA-256: 9f84f0df80d95a9f4bd52feecb60e983513d6d47df9fae409641ebda0b4c330a
font_02_sfnt_off00012c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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