Malicious PDF — malware analysis report

Static analysis result for SHA-256 213ca6e015045b73…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 07:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 975c130d13b6461f10aa19785d6d8c8b SHA-1: 4a665dc3d8936df82723104af1c85c6ad4ae7e31 SHA-256: 213ca6e015045b73f263d8b71973ff20816dfca60b392c3e57036202a59aca78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140225926fbe---21641653239.pdf, are likely intended to deliver further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://dgkno.cn/upload/pasefipi.pdf In PDF document text
    • http://fsf-vastroad.com/userfiles/file/39573231315.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nttq344trqej6k9eeifvgql4u2/xigezipamu.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210907_ABF7090742ABC5C8.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/83159639180.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/96533008720.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/48862846688.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/lapozafovaremowuvifuxut.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/jodiwinap.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/e7umilpfgm4tsluu6vuua6rkv3/vajelusazafevaliv.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407d2a3c1f3---ganavub.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/rupexudimo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140225926fbe---21641653239.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/17696318758.pdfIn PDF document text
    • http://findusafranchise.com/files/files/60308809747.pdfIn PDF document text
    • http://quranday.org/userfiles/file/subibetakofi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/90326637257.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/nudisokikixelarizesaleten.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/vepupoxewudiba.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16155a50c26774---89068999619.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/61153998592.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/7784209066.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/4635817107.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/jagixoruvewedineg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pink+mold+in+poolPDF 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_off0000b344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 9984 bytes
SHA-256: 4dd810aa449d40d77ee510e9dc8fd3aa4c8c86289b734d6c661017cb966032a7
font_02_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 16020 bytes
SHA-256: 9c7b5810f1219d3a866e7736c96139a819b2be84f2d621a93bfc51d6e99c9313