Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8981fa00e6fd11…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 01:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7db619e98c4b2c2c8509d55c85004f42 SHA-1: 10c0600197bd814df21d15cb80f66d2c8251e91b SHA-256: 0e8981fa00e6fd110cd60027e01e11fedc7e638568f4ad7b54d8e5ab7619bc4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate these links are used for SEO manipulation and potentially phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=good+evening+shayari PDF link annotation
    • http://prime42.ru/userfiles/files/82197829818.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7728b3e59---42423615965.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/kavavazu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/76588680117.pdfIn PDF document text
    • https://dptech.vn/uploads/files/24611071611.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/jiwumer.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/doxebafuzomazim.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/veraxovajujilojegogotuk.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/kojubelebezuxutus.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/71970119105.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/jolewekudaburinunaloxalo.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/sajixarope.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mulelopux.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/73748072628.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xibedejowadunak.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109140050158364.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m9h52454q30bmf6e6sgjh0sm47/dikezorinemikakigufanel.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/fuwujifubagalakamegoneg.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ef0d5e1d7c9b0214e7b971323159fc7e/77581456458.pdfIn PDF document text
    • http://kbchina.de/upload/12510323114.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/sujawujomad.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/gozabujoxemo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 19264 bytes
SHA-256: 327e8ec02e4e5ef35ec59b1b6e250584f41cd07a27d4511d80f6356471ae08e2
font_02_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_03_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 10600 bytes
SHA-256: f388acab2a27f1d3d4897b41fe013c7c771092fb06ef216a96eef0c0932cf855

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