Malicious PDF — malware analysis report

Static analysis result for SHA-256 1238ceb13b1ef7ec…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 14:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d5326efdd44e86c70d393f7be05d447 SHA-1: c7604f2832a105acedbaf799d9ef4aa776b02234 SHA-256: 1238ceb13b1ef7ec9424cc98384848625e2d66921185b4ca3c1fdfcc5e509778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and link farm heuristics indicates a redirection mechanism, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nomylo.ru/uplcv?utm_term=idm+free+video+movie+music+%26+torrent+downloader+apk PDF link annotation
    • http://grandfiltr.com/files/file/96617460429.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/79c17c560b9eee7f9af42f6cc9b0d04b/gufevarisizegutek.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/1095619947.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/62229877830.pdfIn PDF document text
    • http://rideco.hu/upload/file/xilikipotazalakufebisoru.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/95396606557.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/naxajetoris.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/41715219403.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///35345080779.pdfIn PDF document text
    • https://fasaac.org/temp/files/tozaxe.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lufipak.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c894dafbdfcc5e72a47094f4d9f9b69/73949210371.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6519756211.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/20495745387.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/64111755961.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/6757681816.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/misisudifituk.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b653ab4a217b9de0a7c9d3b335f29ffe/48496294255.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zegejet.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/17134025303.pdfIn PDF document text
    • http://dhf-china.com/d/files/jonudokesiwuwebifuzi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hrf40h267h78j0p906443elbd9/kilapabuseg.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161355090b2608---kojojo.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_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 10344 bytes
SHA-256: aa1a88216876201097635a3e9247e80e9db15bd9788b4d5a5abf76ef04aafeb0
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 19520 bytes
SHA-256: a05bbbbfb93261af3f6381cb48a7a0fbb83c5f99bb9a57b7bdce2a120cd79d64