Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb97492b58a91dfc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 18:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42c38a72c28704b2aaf926879c77d270 SHA-1: b4e72d80413f669b975d620f2b6a42b0e5a31b5d SHA-256: fb97492b58a91dfcb5557e5e4fb9674837bb615a3fa22fba3a590244089219cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=chess+play+and+learn+mod+apk PDF link annotation
    • http://holzbau-napetschnig.at/25274737208.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/04091234217.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/51878570026.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/44279312554.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/82o2elo1eqr8uj9bmtvh58en72/57964599489.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/23513412886.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/xitajesitamuwise.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/18727444694.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161381eb6b5400---45026214635.pdfIn PDF document text
    • http://metzlerranch.com/userimages/gaxunavifuzitalimeromax.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/lifokuwexulejovakaxekeli.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/65254302466.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolediwevobofarabuk.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/32836694949.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/fisemurifokokodujisu.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/zozibopukipasafusamejife.pdfIn PDF document text
    • http://qdjshg.com/files/file/lejavikis.pdfIn PDF document text
    • http://erdbau-rauch.at/fagusixol.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135683ec8ef0---90226217062.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/mepewoketosudokazegagik.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/46707679128.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e19e4b18766cda03bdcabcf8c2d68b8c/rovumamunukimimo.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/falatiruregusu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/82271224424.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qhgb4pidkljpllf8oki0mv4g26/39167056295.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/91312111613.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_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 10704 bytes
SHA-256: 4cb17a25ee2bae31e22827e789800ebaf9530b7bf3ba2312e84541c19af1a76a
font_01_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 18264 bytes
SHA-256: c8dcbcd263150d4e1187d6440092fee0e95619c8eab4cb18b22de0852d2ba2b9
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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