Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b58e17e53dd50d…

MALICIOUS

PDF

86.4 KB Created: 2021-08-21 10:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2963a72002221ddb9d0f4b70142c71a SHA-1: aef1b0db9609c85552869d989cdf94659ddecc4e SHA-256: 11b58e17e53dd50dab216dc48d938d488954717ddb39fb9a905f2500d6df42fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'utm_term' parameter in one URL suggests a potential lure for specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=disney+plus+hotstar+free+vip+mod+apk PDF link annotation
    • http://supermarketdv.ru/files/file/23657885911.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/60770165655.pdfIn PDF document text
    • http://agavietnam.com/img/files/valisadapekuxun.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/871967129611938b2b399a.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/borawapun.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/18628624882.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/xezijol.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/timaxigukanawoxuwivaloz.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/42928008911.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rid5cl60hd685o8ogasd5ell04/wofubivulakuxujudesumig.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/533537877c64ea41fb9486f4c6101f6f/23223096945.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2839c430---12487551586.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/monuxunifavufoz.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/84241092778.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/lalujoxifizegajufalejefud.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qol87ffplhgiodcni6lamksgui/1606282723.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/8e3c3cb362deff2e6f6ec4e29a2c81da/60717236965.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sttt577cbehape55un9516u2pd/resupukefifagiso.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/58422418865.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210807015757.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k51amte2li7kj0g1k20pcsjcbn/90269057219.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vofetuwifaxuvu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/93a4c348855e7e883ec8df96da0e429b/35010145857.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/80668699552.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54a8f4eed9893347f0ad5c29f2ec4078/wuvoziwokojelozolasa.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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 11136 bytes
SHA-256: 4fd6a22df85c7d5d8a558d8a28330f049bdd3cd0e24c8d6f911372dd9462a514
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 16672 bytes
SHA-256: b06afe5d878fd661c9522c5f42f4bb92eea9edca237fdc6494edb1879492e95e
font_02_sfnt_off000133a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1