Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e0876a19186543…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 14:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7cb48335c1e24180fa0e100945a35f98 SHA-1: a2aa1c87134fb7714dafe34eb5564a3ba94ef9db SHA-256: 14e0876a19186543df6bacc6365f8819dfe7d315b072c77da442c33d8debdd6a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. Crucially, a 'Clipboard command execution lure' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique to trick users into running malicious commands, likely to download and execute a secondary payload.

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 https://coretry.ru/uplcv?utm_term=android+compatibility+layer PDF link annotation
    • https://holcom-wd.holcom.vn/webroot/img/files/69334330366.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_3BD31B600A576C17.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/87891683792.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b74fe475eb912ea3b79d143e980aa666/38033379488.pdfIn PDF document text
    • http://pedraferro.com/files/files/20126495433.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/20862348692.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sirijelifasadovuvixupi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/86fb41faa0c4f999445a1e5d4bf6d004/49751815014.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/fubalorepofidogaxukuxutel.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210902002259.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/tutosuzaw.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/4985680789.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/rudekewajiwaz.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/tugarugofiwene.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/12189068119.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614066cbc4424---62921470516.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/jozurulaxo.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/potener.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/12534504243.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/54019172178.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/rezalagodewidivibodobi.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/majiwudaperojenig.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/5742158481.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/28790530044.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/69495649498.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 18272 bytes
SHA-256: 5b0a0a5a4318e04fb4d938c14d242900af656bf59fc3a0475016c859b9b66db3
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 10740 bytes
SHA-256: d6fdbb66d6341b265cc12bdbe704c9ea2f16e251edf0f3cab4682050f0d96add

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