Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a33d87d1a1911f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 12:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7843203d9d69a91819fad999a3f77c39 SHA-1: a4cc806d0a8da6ff9fd83d1b9e499c2a9101f317 SHA-256: 17a33d87d1a1911fb2dff7e7ffd1d7426cf4528cad18f31a2d9418ef4b59cfeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=send+free+text+message PDF link annotation
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/51186988401.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/jelidanabuwajob.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210903_1807C37E60706FB5.pdfIn PDF document text
    • http://hflchw.com/upload/file/jafigotirafuxunoxaw.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/losabugupazogawojad.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/80474294411.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/50835625441.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1087bd6f---lovovifinuvafu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/xolexiwerubafuxise.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vojinubobuguvokimepituko.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/vajimodagadapix.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/2720407827.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/wesivagakewenebanekagawo.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/65410771907.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11313556624.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/74690603381.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dowetixelupotunawi.pdfIn PDF document text
    • http://pinxedien.net/upload/files/77946532160.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/fosiwibetidinufoxegas.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/jitetigufelupog.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/loxotuwozevagizub.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb1b9bdbd---59213999651.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109111006583796.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6b239df550902c64926d7ff8fc54f5c3/riworunidik.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_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 10616 bytes
SHA-256: c2fbe4cd8f7d4736d0f3a883b11af193ebb95c12e5b78878020084fe00cb5ac5
font_01_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 17892 bytes
SHA-256: 8217d900aef6f0a1f4315faf0a7e2aef92cf93591b13fee81eb7639b2cd3778a

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