Malicious PDF — malware analysis report

Static analysis result for SHA-256 9686c7da9a6b68dd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 10:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a832506b1247ef332c09227a7b0e4ce SHA-1: adc981a174a61ee33ab4a0c50f3b3201d400e71b SHA-256: 9686c7da9a6b68dd3f64c7ec5d21d9a47bfa8e019a97a2eed2385cdd4801babc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a URL with 'download+yacine+app' strongly indicates a lure to download potentially malicious software. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=download+yacine+app
    • http://the-bom.kr/upfile/files/39304592210.pdf
    • http://jinshi66.com/uploadfiles/files/62610536071.pdf
    • http://refpecsbelvaros.hu/kepek/files/49114215336.pdf
    • http://sms-dk.com/FileData/ckfinder/files/20210905_6CD225FD417789DE.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139334734aa4---21026745395.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/lijupigosexabirag.pdf
    • https://onutglen.com/caningest/images/file/fotadabuzefifame.pdf
    • http://perila-vrn.ru/userfiles/file/xuxalalogusewotavawaxit.pdf
    • http://retrievers.su/ckfinder/userfiles/files/48128434966.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d4d88610d7f8cf1a3d4df6f81a034539/93008093629.pdf
    • http://verzorgingsindex.nl/images/uploads/36250855827.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/sibimeb.pdf
    • http://jjburgerut.com/uploads/files/kiwiwajukifabilonem.pdf
    • https://funcarele.com/ckfinder/userfiles/files/88487761148.pdf
    • http://studioferrato.it/userfiles/files/78305256856.pdf
    • http://studioarchperissinotto.eu/userfiles/files/68684284244.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ddd1ad32c---64446159135.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/redopa.pdf
    • https://legend-chang.com/UserFiles/files/38626344139.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/giwoluguri.pdf
    • https://bem-sa.com/img/file/72695479423.pdf
    • http://aarogyamedico.com/userfiles/file/kopigixugas.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zozobijatitubumozebesa.pdf
    • http://hoangnamjsc.com/upload/files/81789028189.pdf
    • http://bajajsports.com/userfiles/file/bibij.pdf
    • https://sportuna.be/ckfinder/userfiles/files/fetuwavunujitonatun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 16792 bytes
font_01_sfnt_off00010268.bin
f02c1cf63973c58dc351bab10db689ab7c5fa848178106fb89aba454256805bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 18324 bytes
font_02_sfnt_off0001317f.bin
b324d9653b3fba8bc92a7ac3b7783f3484fddc2de3d53851071aa9fa4cb34021
pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 10344 bytes