Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e83492f6e12d7b…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 07:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a45ab60f7116b238e74f9b04bfda207e SHA-1: d891bdb4003026269f0dfc94fa3f5b44d053bc8b SHA-256: c6e83492f6e12d7b6fddc85abf363ecf4cf4bfcc6dac3991775064b5f7ec9605
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jupk7kmdao133v7222kn0oa006/40874283994.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6551d7ea---19248620496.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vedelexubonub.pdfIn PDF document text
    • http://nature-revive.org/files/file/16375453778.pdfIn PDF document text
    • http://klpa.net/userData/board/file/14085982422.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/68672967046.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/12845258164.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/61429134225.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/woxiwumupopavilugexepez.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/93854828621.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/57309308476.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/12479618330.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66f64fcd2---tigomipadixorixared.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/36579623575.pdfIn PDF document text
    • http://popmetre.com/news/files/difafasemafevenilog.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/9694859059.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/bovewunerovabeve.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/67933578627.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161355f2b5568c---dapobumepimekusagoseleb.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/26619929575.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/zawetaxezarogoxetub.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xapekisorul.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nazakikike.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/14/marolidebawidenowixux.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/46990252285.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444cfe4bb8b---69874015687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=source+operating+systemPDF 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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10960 bytes
SHA-256: 6d524eac3c3ca72dddbe8e108fcd91377d275989cf8b5bbc5fac63c4609c1863
font_01_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 18276 bytes
SHA-256: 05d184499682f1a398f81b2b22492ed7f5d16c215a498547635ac94854b2bcd3
font_02_sfnt_off00013ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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