Malicious PDF — malware analysis report

Static analysis result for SHA-256 db021cd7a1fe723c…

MALICIOUS

PDF

96.0 KB Created: 2021-06-29 07:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3816a3a6ed8e04f9760880209c08180f SHA-1: a87d4f5972821b436474feb77c476b4c1ad3674e SHA-256: db021cd7a1fe723c821d088844c782a202c1ade324a337e085d7f366afff9dfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure suggests a lure to trick users into clicking on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://chcial.ru/uplcv?utm_term=cell+body+soma+function PDF link annotation
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/c7e0b0a47e1caf925eb5e5eea2457f5b/99910367824.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96d5271ab---sikijepe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9b4c44994---ronijeluvo.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kukoguzebamimasu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b5d42bc2---41014073215.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/54724b82560721c6de60f4bc0bfe6752/zukerowenubamonaxetimarax.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/zubosa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a06bcdb44---20064523899.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44ff28565---gaxorinizusup.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3ikgvqfuq5pvql1q95e1cvgm46/96729450624.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e1310bd8793aaf7a60a0f9ef1cf690af/18348089329.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160861c4f2a252---sejarivizamire.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160901620093a4---dubawakud.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fdecb31fbd941d685253954e17ee37f0/miximofus.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/70069849423.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7741qp1b28c6fn67kfs7326pjd/86103909215.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7bc1609f887eee7e7ce3597d2cd257b0/90913686961.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/domexop.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/pemufesesoduwoz.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/33434834317.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/56vfe1psmanep41vf459j1v445/11526222155.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4593d700a1d7333d45833a54ca5848e6/56954865177.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/lulilubosikedaroge.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076deeabc3ed---77260720608.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/60483a4c9d9a4304d882cd3c5571ae7a/lizarep.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/xilub.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/21715210430.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_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 17336 bytes
SHA-256: e119fcdb4f143991cec3d4fae89a713a2b62f104f0bd7aca65fa5d7c22c8fbe4
font_01_sfnt_off00014119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14119 10924 bytes
SHA-256: bb710d8aa05082291825a5e630f42e5c95b2f18b8df1bdf08b99adf12ce56d3d
font_02_sfnt_off00015a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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