Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a833740ab7e57f3…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 09:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6a95a977ca696f23e4a5acc9f59c2541 SHA-1: dc261692f7f72126055a671e93a5b1679727267e SHA-256: 6a833740ab7e57f3d02667d1fe6aab0a2db6f99648196f9a14cbcaa858ae7e95
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. Crucially, it employs social engineering tactics like 'ClickFix' by instructing the user to copy and paste commands into a terminal, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://chcial.ru/uplcv?utm_term=open+windows+command+prompt PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9b6e81fd---35462474188.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/778db69ededa1e5d8822262de09d9314/rarafamowipev.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd95602d27---kirudotosexebuxe.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/86669668320.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/salozisotof.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca28f357be---dokurutipurupevilijile.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/mizeburimetan.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/24548656383.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/064dc5b35dac2071925d117e341566aa/juvazorefupeto.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947fce0a3b4---duvedofufu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e63da4ad4---37361765011.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/33d0c63956389b119d567639fc22bdcc/57114801522.pdfIn PDF document text
    • https://ebooksweb.net/files/file/nijadaxekadedokeg.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/19785173125.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/zesikiwakafubapuvebelolit.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/80314613821.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/20c7d691e905463719508fc32cecf6f2/45718833401.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nusifuzuw.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qsl0ahh00rpks7mps0u2tiui7h/fogisupazomajikafuze.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/33396465658.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7943ad08e---fomikafabupepez.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cd38151d---90080920680.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/86131434684.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/vuxabigewitujimubiji.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/71h0v504no9176pnt6cf1fuao7/fijulixuwesunemoge.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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 18860 bytes
SHA-256: 466f6226113504469eac8ad7353602ec5477a7b2122569c5d18b1fc59ae5fc7c
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 10740 bytes
SHA-256: 94f83a9e19bf0fb77276d62a4a130315a3f8f2bc4dd53412bd2e76e7258638d5

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