Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cda53c846cd581…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 14:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8faae50c08ee9b7089aada40efabad47 SHA-1: 4224b804d92468ef0ed4daf1dfa07a3ef56589e4 SHA-256: 90cda53c846cd581764ed678da892b9fb713b2e472fe191d9b2de68ae8a00535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains or compromised hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://drafthe.ru/uplcv?utm_term=samsung+galaxy+a50+stock+rom PDF link annotation
    • https://uudanbury.life/files/file/rurixirowozawufuxe.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/dikuvemuzuzarabumo.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/kerawefoxozuj.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210905011238.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/walawesamulitadux.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210917000618.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/goginemolukibofanon.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/12503247168.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mabepanatikadiz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c2896d4117bb582613de6ed72a3e4e8/fejume.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/43531223724.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/petixovurajovedokabikij.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zanopobewezapuxozosemo.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/vagukafidomif.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/55300177896.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/xudisidotizobukaz.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/nedurobisodog.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/17697183719.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161323ae480387---koremalew.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/norofujomusaw.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/lumegajatezaw.pdfIn PDF document text
    • http://belean.pl/userfiles/file/famogipejojutenanazulifa.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/493360431612fdbecc47cb.pdfIn PDF document text
    • https://trieurodata.ro/images/file/34109636676.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/10de3eda95c558b1d432805e7333b13a/76228015229.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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 11088 bytes
SHA-256: d8db3e8cb43261a04b3f9e805cf3c3ed51f25215124c36211fb19393e74af7b7
font_01_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 18312 bytes
SHA-256: 33c61d7f63d71878eef87ecd9ab7e263e9f60807f9f92ebee78736b539181506