Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d099f63229d29b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-24 20:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1d2faee69f2106d899414fcba9a1351 SHA-1: 9ee1128859a9f541a955431da30cdf964799847c SHA-256: 45d099f63229d29bb7a3b06bf25438234956f413728056b209e4c36b88030a6e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS upload directories or disposable hosting. The presence of numerous unknown URLs suggests an attempt to direct users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://gps-ambroisie.com/ressource/site-image/files/nominematiperavujido.pdf In PDF document text
    • http://zgkimsteszew.pl/img/upload/files/kojudaparajelabafujoja.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/sadegalavinokujexupefutow.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161445633e69fb---63844060657.pdfIn PDF document text
    • https://cristalensi.com/public/File/zafif.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/batusuxona.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/butitegurukekegitav.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/78251699826.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/modebisuduxelaboti.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335482d5900---95614487371.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/roxis.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/44058438261.pdfIn PDF document text
    • https://sanagustin.cl/files/mujopevofi.pdfIn PDF document text
    • http://yuli-china.ru/d/files/39722987643.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/xujuxiguwataj.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/xoxijuzotalesizef.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/fevaboronoxulut.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/menatos.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/wuxogudagoxasurunub.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/822545711.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/12338737647.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/23949129188.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614197d8e28b7---39628008352.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/24601800752.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/34715386472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+turn+amber+alert+off+on+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_off0000b6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 10664 bytes
SHA-256: 8ef1d6b01bc1f0876123d2d2b24409ce929581d502e1eb16624780b21109c4e2
font_01_sfnt_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 18448 bytes
SHA-256: 6a64275bbbd8e537d240f682e6483b67c1d97e3e0a2b92e16f332cff1d730632
font_02_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1