Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1617b997de1874…

MALICIOUS

PDF

90.8 KB Created: 2021-09-08 07:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2a53cc3d75bca21f5a4b78f71ccbabc SHA-1: bc213188f2dcc730d2f2441567011ef06ba81cd3 SHA-256: 5e1617b997de1874340c6c835af5a2e60cfa4038bf8e3173275207ddcc77a5fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=beamer+latex+pdf PDF link annotation
    • https://ajitcoatings.com/uploads/47226032252.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90c0a96c26---82189177006.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce411e70b---fafirutatuvo.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/56466444054.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/30182291302.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/50244494471.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/57232898893.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bcc23852eb82bf4e4da46226086d3a17/wapupumopel.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/29630048833.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/74242670570.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/27753602309.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/73983575578.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab7f7d0fa06e0a133098ac7722c5247e/14701263311.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/giwaroberile.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/4219e06f4149c11d52f192b0e76bcdef/94718986259.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dipazabutuzel.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/33951286062.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/xumavevorowanele.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/4463741313.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/75451541957.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161253db4e0662---zixeler.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/dogipunexiwabujokubevav.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210708_B8EDFB7226BECEA9.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ceefbbb28f---bafotemigimuxamukomarisij.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 10328 bytes
SHA-256: 56fd4caf562449a986393b74a9e517adb58aed1ba84beede5b0088b303adc4ac
font_01_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 19112 bytes
SHA-256: 56ce8d74bc39242ab9f240a23f3638f75a878a48ae5053f64b5e0e3a88c1f4b3
font_02_sfnt_off000145fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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