Malicious PDF — malware analysis report

Static analysis result for SHA-256 8915df53059558a3…

MALICIOUS

PDF

89.9 KB Created: 2021-08-06 21:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b699cb3cc15ac313e541023b234aba3f SHA-1: a6b273c080bb88046080690f6206a1511f61c1c8 SHA-256: 8915df53059558a366b4555893c5f0f0eeda20a74eb2069c05a4c5ce4caf9743
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a 'Clipboard command execution lure', instructing users to copy and paste content into a shell, which is a common technique to trick users into running malicious commands. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to host or distribute secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://vieclamxaydung24h.com/upload/files/dibutomo.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hslgg04jj839feuer9u4jdbt2e/dusexakawat.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/mobiw.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8bced2c9---80326435815.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/45553427328.pdfIn PDF document text
    • http://com123.vn/uploads/file/60790962829.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609201e1393af---4731217565.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7497dbf612da26358e174b237c0e9407/lijofopobojuwozi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859db302ddd---76355383322.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/3743559160.pdfIn PDF document text
    • http://groupkaishan.com/d/files/nagovunixivowavuku.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0277330cc3---sibafoliwuwajirefofovod.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/b4281f5225fd00b9be5a0fb6e40432e4.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ed918665---rodalurefuxe.pdfIn PDF document text
    • http://prestopc.it/upload/file/zetoxixikivaturune.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeec4388b4---lojozasuwoluwesawajibuwon.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/9441678934.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9468d15791274b6f15b68bcd0e59599a/34726837027.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/vupadit.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/60l65en98c1rgsqelvgd2m9mr4/17037051580.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/bujijifezas.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/terevuparufafajibutenoga.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af8142a48c8456c933425c72b489925e/18240132860.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/78882650580.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/fumovepelilore.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/38348574462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+keyboard+keys+back+to+normal+windows+10PDF link annotation
    • 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_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 11412 bytes
SHA-256: 1f28c4fbb565778df92f1084d9e24dc21a3c8adf2f69fec1891385a68c88dad8
font_01_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 17892 bytes
SHA-256: e80ec729f89e1022b668a5bab41d5bb6512daee65aeafb0610add9ba74903cf5