Malicious PDF — malware analysis report

Static analysis result for SHA-256 df91a822cd4e312b…

MALICIOUS

PDF

99.2 KB Created: 2021-08-07 02:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d3faba4db8e120e00df3cf5638e6cbd9 SHA-1: 8bd49461459025ab49119df9d97b65be2c65b20d SHA-256: df91a822cd4e312ba6aea310214ce2447253335fe4af41c014f33c58edb02945
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 PowerShell

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm and attempts social engineering by luring the user to install a browser extension or update, or to copy/paste commands into a shell. These lures suggest the document is designed to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b6dc3b8b9---borisaxuzotegaluzotoliv.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16087714232423---kipedavas.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/h2m7d3tgacjru77k6o76p50fid/muvofaxu.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/deveg.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fd4c87e78---26620078147.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/84554743483.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/15184136304.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6ab1aee40f51662e34108103baf3b888/99868093398.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/pekuwejurer.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/48981226691.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70c101c87---93017455169.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wilolinobizir.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/jepapejiguxojitiwudo.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/mides.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f36fcffed---3721507628.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/39789733932.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824eb8192af---defifuzozobafutajuji.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160886a9d9af34---goxowezaxusirexejimilo.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kawiri.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78707054757.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/fafum.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf0b8652fe---wulamedepojopunet.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/99955408362.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/jugizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=shell+shockers+aimbot+githubPDF 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_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 19200 bytes
SHA-256: 74cfabd90da592aa170060955a376ae770b8afd05d0dbb0ec331aff62ff27f9c
font_01_sfnt_off00014b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B46 10980 bytes
SHA-256: 37ad4eafd694f65beba85bca1e534e923afad054fd73a8bd77e6cc14d1b7b060
font_02_sfnt_off000164d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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