Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b200a60d23ad86…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 18:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc74863ebc95578e9ed28813bfdccb34 SHA-1: a185b0cc8df82747e7b2892431e036d7454d738c SHA-256: f2b200a60d23ad869897405f64857c92f8f602679944f0ff04cf36fb0a243d74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://shijijiaming.net/filespath/files/20210906175128.pdf In PDF document text
    • https://035620126.tw/upload/greenkitchen/files/64223694817.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2d98655aa35c97bd1d2f9fa3dd7e509d/rajitovepivasemanuxo.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/xudikatowa.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/palifa.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/guvetazifasixavalutobike.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/977f6fe10427b5d1286fd751bbbd52b4/sokomifo.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/bevodimilodu.pdfIn PDF document text
    • http://egitara.com/upfiles/files/98695447768.pdfIn PDF document text
    • http://citranco.com/users/files/23260681736.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/70076530047.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/kifubezo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/10156b0cd1c5d69f0ead6bc24f65c91a/6351411944.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134d52ef2330---dosuwaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480c61dcf7---89518030872.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jepumenoliwubitubi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b686d68df---vobumazavenele.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/wowuledolimixufavani.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/4340338926.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/72200007994.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/42063744127.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/19348949818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+go+tweaked+apkPDF 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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 21956 bytes
SHA-256: c3675c9408e972b5acd144cfadfd08b83e76cf71a40729fd1dfb513a4522918e
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 10508 bytes
SHA-256: 8badd7f8a40ab1d975c82a8931d6844a64f8dc80dd2bab1c04d307d54ce3d967
font_02_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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