Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99296948c8b3c64…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 02:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0591c7c2488ff2bb88e7c1dda172ad44 SHA-1: 244d4a5b2e8107e8c2546a38b26dc6fc29fbe3af SHA-256: d99296948c8b3c646c2a132807f5d09407267e3aabc4259cb8e85c5481e65263
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a lure instructing the user to copy and paste content into a command-line interface, a common tactic to bypass security controls and execute downloaded payloads. Several URLs point to compromised websites or disposable hosting, likely serving as download locations for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://acrclubinversores.com/files/galeria/files/49124207695.pdf In PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/belamipikof.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/89387220243.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6ne05ri9gk26scnsdf1qalh6tb/91290836190.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qtuu5knumau1q1f567g4jjsm0/34348303404.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/garesomexero.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gofutizepufopudisujo.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/72398758047.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/26529260886.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/nugizosebefujuliwa.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/tedajexugobozonizilelip.pdfIn PDF document text
    • https://media-get.com/userfiles/files/1884813451.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/49730272649.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7luc569umneco30p5gfc8nq9m8/duledogules.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/31896916112.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/bilozufokegedez.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/13291708548.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613570c592d42---24227166289.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210912052912_c8dovd.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/94052133899.pdfIn PDF document text
    • http://isvpro.com/custom/files/selepulabavimeduretaful.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134304ccfa2e---4492286755.pdfIn PDF document text
    • https://angem.fr/userfiles/file/kuxakewodanopinazetuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+hack+social+media+accounts+using+termuxPDF 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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 20036 bytes
SHA-256: 8e884c89806a5a34a388ae7f6bcaf6d1fc4d08291e66232b5a2dfd66f7670f0d
font_01_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 11188 bytes
SHA-256: c8d5b2f897b85f1ee61ed13d51ca6d6aca51821fe311bb0f2cc1d7ceb7041011

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