Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0c461a2aa60b80…

MALICIOUS

PDF

69.1 KB Created: 2021-09-21 21:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5102ac550ed263779cb61aa0c91a6a2 SHA-1: 31e3cd878951969b1cbeb4d0f0f4746beb39dbc5 SHA-256: ed0c461a2aa60b805a0832f787a6ca0258e29cf46fb21635da0f7308faea72a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities to download and execute further malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://jaluzipro.ru/public/userfiles/file/34802473921.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4be93f5---nofumaw.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/24313553268.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/86611045845.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/butobidadaviju.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/75574170190.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_00_21_21_9833.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/refewalebobiv.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109040316373062.pdfIn PDF document text
    • https://kildevangen.dk/files/nobemuwabizusepu.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/fuzolof.pdfIn PDF document text
    • https://noventa.cz/media/files/file/gewurexozukerilu.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/90834850201.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/95548828988.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/23769713177.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ed8f9dc---zeburipudu.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/25282712127.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/53615c05f22dec3cf98e7e72ca104acc/89781500247.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bujen.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xarekus.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/66604149108.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/gevemiliguxodu.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/sulenokeg.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/lolelujebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=square+root+of+xPDF 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_off0000b150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB150 10220 bytes
SHA-256: b02547ad84c0d7f56ce1c5f05baf23354bb9b53f41bb3ebdb0a86bc6a4e7e17c
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 15192 bytes
SHA-256: 41587e015c1f9cd7d80fbfb2cf9449b833beaa55da9dde399508d1a98247342a
font_02_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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