Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7566f20b8858ce…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 10:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f5502d1794ebb1e844b98fd27ba8a126 SHA-1: 35e382d9f01b375af016682ec6255bc7200f8fc5 SHA-256: aa7566f20b8858ceb5943dc4743bc818b91a841476ae6beff1f80715980a7c87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://comtraining.cl/userfiles/files/74876207256.pdf In PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/xekuwelamazevikonu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rhku94ghgcl1mef1nlck32a3hu/lupivawukenaw.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3087e0dc9e---68302223279.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/karubemuvodipizuviruf.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/wizajowererugo.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/879f54b9b5bc09d75b816cef4f9d1b58/mibukubijitat.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i2n2nfgf97mii2e5vaf7jf4gvs/14171233999.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wuxorakefuvanimokubexuxo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a4316a7390f---68828883794.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/95662776605.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/be87847fc14fdb00762e551dd2dd27ae/97013913603.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/46d292b6d7a51ce4a78fd07087745b0e/68490385063.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acde822cb80---vaxetukomanaj.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/9625650428.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/27816852174.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/zotonisereko.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/32757751550.pdfIn PDF document text
    • https://basisnomor.com/contents//files/kuteme.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/26331501404.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/45325963002.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4cdd8603---zopavuge.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/nabenixivogokalokakup.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37b7ef6f9---80229393619.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/33226174129.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c57e9619a---39604648364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ice+age+3+full+movie+in+hindi+free+download+300mbPDF 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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 11296 bytes
SHA-256: 2640060f60d1e5de9d564f498696425326fc82df0cb4d394c656d3a595b29860
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 17280 bytes
SHA-256: ad75c286b3b6fc9f8b74c86581f8f601412fa98f2b83ffe8a519b5729716ec33

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