Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa514edb1c91319…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 00:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ce23ec71dc34cc3f3d6832af024ff5d SHA-1: b638c73da5ed48ebc02176748dfdbfff412ff18c SHA-256: eaa514edb1c91319132b40841c9945e39538b4d9ade3f73e486745c37f9eab71
164 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of these elements suggests the document is designed to lure users into clicking malicious links, likely for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hk-sai.com/ckfinder/userfiles/files/kefexakavixum.pdf In PDF document text
    • https://best-label.com/upload/files/tobibitanunas.pdfIn PDF document text
    • http://baoveantam.org/upload/files/76306621153.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/95696293334.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/keditipedanomabutazoka.pdfIn PDF document text
    • http://feg.vn/uploads/files/80160848554.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/bosaremogovupalomofapupo.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/kofidasixowusudawap.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01c2f23e2---50540765458.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/bupamivagijotirof.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/kogikujatosa.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/72209860659.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xulun.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/vebat.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/657f3b6955d7a5d7596069592926fdb7/67073122531.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/59939528835.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/14362905398.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/najoginixamefomi.pdfIn PDF document text
    • http://arsvet.ru/img/upload/zuromibanekevudobotovomo.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/turirixu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/73524226567.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161409e8c9a16f---nasuvinuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=instalar+idioma+portugues+brasil+androidPDF 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_off0000bbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB6 19260 bytes
SHA-256: 899381dc99e89c6838abbfaaf6f2849839633d9a20dd813f42b184fe67fd299b
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10928 bytes
SHA-256: c3408dee398367a6d41e66874163a301be336270f7de7e39b70fd65a34830a76

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