Malicious PDF — malware analysis report

Static analysis result for SHA-256 10520be98f4e4d16…

MALICIOUS

PDF

88.5 KB Created: 2021-07-10 10:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9790e5ecfe1507e03f323b93fa5aa2b SHA-1: 5d352a1199f86e2c500096a71a720a7169ce3955 SHA-256: 10520be98f4e4d1679bb2679e2a3144dfcb159bd6a952ea0229f3354f65d4b21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://philabc.ru/uplcv?utm_term=overwintering+pepper+plants+outside PDF link annotation
    • http://czdashan.cn/uploadfile/file/2021070610432073499.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d30a14515---xoluwanulimatugegumu.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/18129797698.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/pijofifuvifaguraze.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d4253b9d5131bd678735a5471490c3fc/13698118279.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/ponijevemibopowo.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/15901813914.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/48783117581.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/7509167562.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/32669143470.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d551ddd11b---vibosemorojobemapil.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e945c5f36---24815152236.pdfIn PDF document text
    • http://lagrupacio.cat/file/82482769454.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160897a43d1f65---mupomiruzude.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723b525a6c---57567304066.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/norirapopajeganel.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/47401077657.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/denlfrl8pv67vd7l8arrjla0nv/2503770243.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/75836d04c89414e9e00cb2dc8c8a189b/xaxavu.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/20886989691.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6c790c1fc094efc43ac8a34df5cbfb34/luzesilubavanekogiladinu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/29ebab99398075f21978511f7a50749c/molelafo.pdfIn PDF document text
    • http://quaint-house.com/dovubizerulamo.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/222040761.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099efaa6cbae---27820957569.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r13mnbnq07qrqovv5c9b7mttdp/53310314574.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/moxiduzu.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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 17096 bytes
SHA-256: d0bd68836164c15822600fb20376e797dc69a63ad3b9a4b9967b097667c537c6
font_01_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 10844 bytes
SHA-256: 2ffa2322db63a3b87ba8e28fa899f6c733027975f0f3b7f58052bf61f3149c07
font_02_sfnt_off00013c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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