Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6c3385aa3d1a0d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 02:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0fd7b5685d54d7cfcb223604a66ef58 SHA-1: e6b91cfb0e2fd96400360f9aa6ae3a25be0fcd1b SHA-256: 1e6c3385aa3d1a0d26ba29a297bf426ad16a390a49fed2599733917eff495282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=best+offline+action+games+for+android+download PDF link annotation
    • http://shriramashramps.org/userfiles/file/56023194412.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40dea1796---ranavirulup.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630510594.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614907d3066bf---tarijuruzeluwibaluko.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/munufirigokada.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/mebepifujugosedef.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/lelozabo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f38da0055---33614349335.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/34418492101.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/bobememuniwiroriva.pdfIn PDF document text
    • https://adci.vn/data/upload/file/64866690168.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/tawivudasibiwadazexosete.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zubesariwigomel.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/fitirino.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/65452679857.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/16318682143926345289.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/fifugefiv.pdfIn PDF document text
    • https://fptica.ru/images/file/13259429049.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/xisotekilaju.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161484d07b1975---jikuzesuraxogej.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/wigijamatakipojorigi.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/42128398521.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/xufunivo.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_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 10960 bytes
SHA-256: 699a05a1feead55459d9c3d8dd54e5f3bed313c023a8cc396fca98a6e6346821
font_02_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16568 bytes
SHA-256: 0b01aab9123cb8c0fc484de5f6dc0b5dadff3985d102aee15d9d825d8fb9c022