Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c25a33ce5af914e…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 12:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a00cda81172cb85572775e2ff9e78b8b SHA-1: cdc6e5048dd19b5848f9c455fd3790118c88d44a SHA-256: 8c25a33ce5af914e4d988f28f856acc6d667283e50c1647fe85bcd71a9c648a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate that the PDF's primary function is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://queure.ru/uplcv?utm_term=how+to+get+money+in+bannerlord PDF link annotation
    • http://ufnk.fr/app/webroot/files/file/seneserimi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b280caa715---tupibiwefikufebor.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/50283566762.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210914070213112551.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/dipubuwuwuw.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495b5581dfc---98223295865.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/19090481680.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/rawidusutiwofufuk.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c48541179cd76f6a9434e91cb4eb0be8/31984678744.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/zawinodiv.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/mivozir.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/sevajebupevuxalulunerapil.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/87284315179.pdfIn PDF document text
    • http://www.andreapondika.cz/file/74297519952.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/20925485746.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///88100027031.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/16740213938.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/70175387484.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/35978105146.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/sakakavezigukila.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/duzovarebuzemudiri.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dd2d0be3---21624164811.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/gajawotefivobixesag.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/35189726807.pdfIn PDF document text
    • http://selidbe-beograd.info/files/5642490439.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109261338398093.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc16099ae8---fubazifapizokajifegor.pdfIn PDF document text
    • 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_off0000b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 10752 bytes
SHA-256: 52030c085b5db73b7a850a49248fcc2e93bfc0fe190f13d9ca800859106744a5
font_02_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16836 bytes
SHA-256: 820b5c8efc9e961900b20056d66d0e179329ec2bb7f89a4a0204d29c9eb65b4e

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