Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a2d197ed69c6ab…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 13:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ee53dbacb032eed5a8b52ebbe248c7b SHA-1: 5c9ca8fa01c2d80881bf7601494b480ab1a0b99c SHA-256: e3a2d197ed69c6ab139def7f278d1b7ae3fee5b814db165c024c11eda82086e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm. Several embedded URLs point to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://atlanticcompact.org/userfiles/files/kiworomuzifit.pdf In PDF document text
    • https://callmarkinvestments.com/callmark/files/23885916804.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mezizabupag.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/35982246018.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/78659826782.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/40564333831.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25791fd80---burudupow.pdfIn PDF document text
    • http://holzbau-napetschnig.at/guvurotapazunomose.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/puzikedikibelak.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4695673952.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/fiderofuvudukikulitasu.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/bosefamex.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3ecd82bd---lanajukosafagipojuxeju.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/wawekujugozunawizosidav.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9f5c0c270b83ec9800983a19efb6f6cc/jexorotudoruminasebawuwil.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zixasalajuresafe.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/55118552080.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/55055222555.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/zojisamekazikikivosakaxok.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/88501843520.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/dutupeb.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/mawurogubamekozavame.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202194457257737.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/88743808128.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/nagedigofunuxuvulot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=keep+screen+on+during+call+androidPDF 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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 10684 bytes
SHA-256: 9217a2edba363ba5815a8a1b8507d9ef6a0f11542f074ba943fa8e64421b6417
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 18492 bytes
SHA-256: dacc18fd85804bff8dd3feb30f82987d52e3fe8d208ab8ffc1262bdc0a036a9e