Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbe753195ee5775…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 05:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4924e10b26684d4c6e2aa43e7771561d SHA-1: e9ac6c878f696ee803c7e74530bc458a93b79bcc SHA-256: 6cbe753195ee5775f21aa8b0feba3260012f0e1ca705ba9a2979eedd3c167fba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The primary goal appears to be luring users to download files from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342558b6dd3---xezakuretujekale.pdf In PDF document text
    • http://to-kajihan.net/js/upload/files/67313652322.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/wakepoduvelexuwu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911031104_1gem6a.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/19943171450.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/lufufokiboxawegos.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d7821786f4ed3791f7352e66bf851e0d/kudup.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/83389596087.pdfIn PDF document text
    • http://scantech3d.com/files/82225829188.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1276865492625090885e3a6b9fb5045d/nidami.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/255954b62d76cd65e30834e710014dfd/lisuninipasetusuti.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/94452579419.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161377a52affbd---37953441209.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/1501371773.pdfIn PDF document text
    • http://greenglobepms.com/uploads/25988445936.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/51274799031.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/dobutovasa.pdfIn PDF document text
    • https://harmony.im/userfiles/file/puxafavawowa.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/vemimi.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/xafidujipilunasevawam.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/fuvovotudigig.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/63661000852.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/51490045412.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/nufadukifene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=8+ball+pool+mod+menu+2020PDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 16728 bytes
SHA-256: 5e0e81a8161df91d4c29fab8e9ca78191ebec3737cfc3106713c55d37ee924c8
font_02_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 10688 bytes
SHA-256: ea7b17bf31e7048e24e56ed2a698d386ff9d619bc6be9b38b9601cc3590f67a5

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