Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4c7f7041eaf73c…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 01:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8f5db54d0a1dbeaba64a5ee2e27fc366 SHA-1: fd8e9abdac3077f3ff1e00d42be4962eb4245d67 SHA-256: 1b4c7f7041eaf73cadb5eaace8f4d8cc215fd7cfb32ff64b879b483d0414c79b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and contains a lure for clipboard command execution. The document's content, though obfuscated, suggests an attempt to trick the user into running commands, likely to download and execute a secondary payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://amphorabeautyclub.com/campannas/file/nabenogujej.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4634c22daefad386f9b6b56e6a585dfe/vifevarigowevokijapixo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3e432fada3631ebb29c6477bfff464fd/50415457378.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608887e47c81d---72026408347.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a89bbbd6377---23665190670.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/21536319579.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c090c85ac246f5a0034e3fbcc2b58192/rudezubasideruwijewug.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087980b7381f---67739777421.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/pilulo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d686a093---jexepeziwodu.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/mupusaxojobuboxurotafiru.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160881964f2aa4---jiwulowubuwafilegoseni.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/328bef5bb33571d1ef8340ee7b311e40/80868871054.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/37339367661.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/4134025374.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/deb82676441563086eb10f4126c6d520/28686327225.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/febegibosekenoruk.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/wovexib.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9f92a3c2b3e8e80e325291d52a5b9363/61594995143.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/25193341744.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858adf5c399---papagobimudewevozafe.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/54947159383.pdfIn PDF document text
    • https://jobtiara.com/files/files/44521973437.pdfIn PDF document text
    • http://artside.org/data/temp/file/lobaweloxejog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=windows+10+iso+file+download+to+usbPDF 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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 16816 bytes
SHA-256: a6b8a1fc50a5e73a3fa5124332b22c63a7716e69a8fe379573627ea5e2830a67
font_02_sfnt_off00012baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 10740 bytes
SHA-256: f710684417dc3785ca94765a70a68966630782d49a61f1e8b9d644e235e1c367

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