Malicious PDF — malware analysis report

Static analysis result for SHA-256 353fef0ec86f150a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 06:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4977314c2a3b8e10fbfced21e455623d SHA-1: 463bf043dc1c82b2531cd677b1ee2d57c0872da8 SHA-256: 353fef0ec86f150a3128ebf882ccf26f89672500ca07b4a1f77d55a6a9ffcf28
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://carzip.biz/files/uploads/files/49266104187.pdf In PDF document text
    • http://ingatlantv.tv/userfiles/files/79408767059.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/3816817022.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_142805.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872253afd41---manamutolef.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ea52023525f8615a75a7cec7053546d2/32058519469.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e53b57fa93---91829235096.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/xonamuvite.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae582730c---47194131873.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/52899170909.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/fasabenesowidomoparujip.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/xirixazapomiramizijufo.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/8573514190.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rg2m777nr6v3jlds4ub4l8lc21/43743175253.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/nubigoluvekibonam.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4c8b714ea4df7304f13b1606b3360f0/93357145309.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/bonenotegewadokaruluduz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbadf248d5---41811775984.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/9814401925.pdfIn PDF document text
    • http://topp.pl/_topp/file/99059990912.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/omig36rtq4hgejnt0e9655cbkp/rupokaxujolov.pdfIn PDF document text
    • http://mamam.by/upload/File/file/kujabetujevud.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8709f36f3c---74140621814.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/49641667219.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108280452004544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=turbo-x+android+tv+box+manualPDF 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_off0000bf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 10512 bytes
SHA-256: e2d367208da9d961345ef1098a5f38f6369f61eb3465d7c3df136133a38656fd
font_01_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 17016 bytes
SHA-256: eeef1297914889b32e6e6723a45032e53136ac32bb00c8d39aab186f869f0d20
font_02_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1