Malicious PDF — malware analysis report

Static analysis result for SHA-256 52aed0a4e01adcd9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 04:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b7bdcdc40c55e03b58b23e83f81d993 SHA-1: 1ae93ec53ba845a9e1712aebdf4e1612184efa67 SHA-256: 52aed0a4e01adcd9a3fa9f7727c9052c6f56af1e472dfe0232bc715a821f8985
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external links, many hosted on compromised or disposable domains, further suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hosteleriayvending.com/ckfinder/userfiles/files/venenozaratezufuxid.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/53998196980.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/83143649297.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/wowadifagibobaxoberulozob.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/87352470565.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613506419639b---73552018376.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/li7lueogd27er32poppmja6c80/zupifufe.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/01sgne4cojfmkt5vba7e2s8lo6/84140358480.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/8568518021.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/88721818472.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/43421588767.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/renupadubusenemudateba.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/75224928623.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/24156578581.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/24795693369.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/dexelebe.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/rodifubijorifizuwidumejob.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/4811019803.pdfIn PDF document text
    • https://greenways.at/userfiles/file/84566513377.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/59086827685.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/52299903219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+new+world+order+by+a+ralph+epperson+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_02_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10708 bytes
SHA-256: e68392c8644d631a2e8b6929452a6ba4736fe033d6d24d180c16a8bf08cb9cbb
font_03_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 17944 bytes
SHA-256: 1e2aa3c48fe7b01a2fabd1453cea22ce899961afa036aad88dfb3cc44ae2fdc4

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