Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acb12a5369d2d57…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 01:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 413e846fea411bf2e4b7229ebc166658 SHA-1: a9c9b777ba696fe72b0c37758af088cc329ff27e SHA-256: 7acb12a5369d2d571ca244a97cfbe01a412db17e7529cbc3ddccc109a43dd065
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or employs social engineering. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable or potentially malicious domains. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for JavaScript execution or exploitation of PDF reader vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://metaglas.kr/userData/board/file/xotipokatitusomopukajo.pdf In PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/56023462134.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a9448c5a89fc57ec3f0e5f54685223ff/72810193446.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/rogavavib.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5504d9fa---fubuketufivomuwag.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134b88263882---56589011941.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/39109185439.pdfIn PDF document text
    • http://chromavials.com/d/files/bopukujipuxabasanunudo.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/lukaditol.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/88397889100.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e095eb8bde---22491231094.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0605630001625766265.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f5a3d358104ef12e51a077787fbbda63/17903741213.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a575c74018b230fe431c90dc5264416e/butizenigo.pdfIn PDF document text
    • https://immobilgold.com/file/nodevupitukapebuxuvuk.pdfIn PDF document text
    • https://baptistfriends.org/media/penarolot.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/vetir.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/59992024892.pdfIn PDF document text
    • http://yuha.be/_files/file/50227317631.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9972ba53e71158643d22ca4dd7ed824b/dopezogoxokimotovanof.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/dff652925c8abc656d9685f468a6a669/50219768693.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/23413798824.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160985aecf4029---66817252958.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dizedu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tt37gclef8fura3acnpf3hplfl/xibipaxelibogekuxusoji.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/darorizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pentaho+cde+tutorial+pdfPDF 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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 19636 bytes
SHA-256: 99a1969f5f3bd7fa644a22ef866c5bd380c237522f70bb066f2ad64031e9c401
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 10648 bytes
SHA-256: b55743d0f9cc3934bd10437b62aff896dd55d4c9b9fb3bd5ffcdb0ef7c6e76ec
font_02_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1