Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8692abba55c477…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 23:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b39271b0398a3c2574af8a85b549cba SHA-1: 03014b16006f3e4f5c9330066d0ee811cd4c7086 SHA-256: dc8692abba55c477501bdc1b1a8651185b7eaa9cca909e2e8c001e7bad781517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trovas.com/userimages/97540534199.pdf In PDF document text
    • https://dobski.pl/userfiles/file/34981223324.pdfIn PDF document text
    • http://lj-group.cn/upload/files/76870190394.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/25074894912.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/92246497638.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/fedotuluvemowevipudimodam.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a8aef7932dce5591da38f4821a310c3c/loruxikukumed.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d82ead91---jezatepapajudazuw.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/430101152.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/mokavozigexinopifuwol.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/52456328156.pdfIn PDF document text
    • https://coluer.ir/documents/file/mikuwatexujukarorazizewo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4b03db8b---21065352544.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/21220737944.pdfIn PDF document text
    • http://speckrepej.com/upload/file/sutitudedusiwafitoxibaz.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/tumekotewunivaxedo.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/banejisofijomigereniloroj.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b174ca7---7773011123.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/40210527873.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210907152923.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/27816476678.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/kusufakotarujodazo.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dudedirabulalokimunuge.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/21365302896.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/17993402321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pasar+whatsapp+de+iphone+a+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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 10528 bytes
SHA-256: 1d1d33527c70300497bd4d7127baf5bb8e9d1cb962737a5ad9a04d84198dfc15
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 18004 bytes
SHA-256: 32f08560c2c4644dc5b2baec71584df3992fb0e2e51797b2527d80325956783b
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.