Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fa1a17846261d9…

MALICIOUS

PDF

77.8 KB Created: 2021-08-14 08:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7cf3f9e98371756620fcd465d04d8aed SHA-1: 6b439c02e671320d4877595d3cd57d7e8a62a687 SHA-256: e7fa1a17846261d9b6bde1f35e28d2a27403be6c4f4cf02577c7dcfa14c8dea3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to phishing or malware download sites. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://allytemp.ru/uplcv?utm_term=libro+72+nombres+de+dios+pdf PDF link annotation
    • http://korea-labels.com/ckfinder/userfiles/files/rufepotelabe.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42e1cb6cbe04d9ee1fca0cd4db5090d9/nirirujiga.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/resudezi.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/51685933720.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/1a77b850367bfdf304f15da38dbbaab7/37998504571.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/77401578869.pdfIn PDF document text
    • http://regmac.net/userfiles/files/43413390838.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5bba1c2e7---bunirazivawaxupalebabogu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ja3koq2hv24lbmv1k62kl96hu2/68029345577.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/931e99a24d0e595dfb60621d926b98fd/sokamasidixewabavibuke.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/339e825cb92d13f95e1d38de96900609/80275888442.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/792514504cae489fe3e0c69ec49a0a70/joxonipukurazuvemarawa.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/78677806952.pdfIn PDF document text
    • http://cbstav.cz/file/13124982599.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0ebebb98502b4bbfd462a0f49193ce5d/57573936373.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e11a9a7cd7b---72273678507.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5jdj5bf5gvp2r3u2fho23em8s2/tomusodeselo.pdfIn PDF document text
    • http://adveotec.com/img/file/vaterisujetiparek.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/dironodebubavi.pdfIn PDF document text
    • https://allianztc.ro/files/file/xutusinazuzal.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/8310894406.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d82c725ae08---bukiliwak.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/58696398059.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/00d1d7068a3f08f39c7fc1ee3fdb9447/24018570902.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e891f799d01---74347843746.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 17484 bytes
SHA-256: f9254650f20de7547c79cf182e39ce009b3a3af19de6acde9b8ce7a9d6407963
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 10620 bytes
SHA-256: 9498242db9bbb5b228bdce7c5a5ca1eba8bdb63b199979124a71b9fba47648ef
font_02_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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