Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3ef08c42e25feb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 15:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1f9e3bca59ab90fc2b8aea1d33cbac8 SHA-1: 062c56e24a4e89e7d5a520e963b14171a9a3dd71 SHA-256: 8b3ef08c42e25feb0b20a8a17e4fa277cc4de85b95f490b091992ac03a43d82b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://business-baltic.com/myfiles/dok/29775547826.pdf In PDF document text
    • https://uclerbaklava.com/resources/file/18328270390.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/10116300461.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/53355160614.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/sodibiniwixadozul.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/27183771069.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/54605071894.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f36e35f68---73117287382.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/sizowe.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/tixetujenizi.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/wokalabulivok.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/50567666676.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210903155914.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a0894b44---79197988234.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/72000100003.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/suxinitumijunosetado.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd8dc7faa---4070430275.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/shf0o8jc5c63klm56591d9u02a/vigiboligadofifoge.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133793238d73---82405611864.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/64583162659.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/41010759539.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/dawekukezudarexik.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/ferukives.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/23827236565.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/5433952149.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/masezanow.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/gevivanuvulojalaguso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=real+racing+3+obb+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D0 10600 bytes
SHA-256: 92e58e3aebb3ff9e3bce27169b06e29d551d009b36b36a76c811a87011ac5c81
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 21528 bytes
SHA-256: e313f4d8fc0bd22690754ee873f02fc1ba32ddf3d70359935e2ce0c728922954
font_03_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583

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