Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df1e5d852df4960…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 11:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8498dfaaedaa5b0547ff6ea7eadb9989 SHA-1: 9e93f84dfa4d112259b800466741d3531a958952 SHA-256: 9df1e5d852df496080355742ac46ec251a99dddcf6ee3f01034b3b3c173bef3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external sites, one of which is explicitly for downloading 'clash of royale mod'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=download+clash+of+royale+mod PDF link annotation
    • http://www.fashiongale.ro/userfiles/files/xegonudajabekegikajutebe.pdfIn PDF document text
    • http://benrassam.com/uploads/files/53974459380.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/53103071093.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/lojajazajalipiga.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/togidexeverigom.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/2722315177.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9bls2adirpj4f6ie0j6av5q81a/89656960322.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/wawesubebanevelumamopeved.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/gosetatujuwijigoxafekud.pdfIn PDF document text
    • http://net-marketing.hu/images/files/57957625796.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/12862103380.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/resuperijoro.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_022722.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/2552237755.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/30759708857.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905115655.pdfIn PDF document text
    • https://upaspor.com/resimler/files/84506246020.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/76737258736.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/74315994812.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6be3891813b52b181f4ebac70c5774f2/dakapaxigewokutotosuvaf.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/ridosujinetuzepofakijizo.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/13878984300.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zomov.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346e133d56b---47521023231.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/jogifatawasipof.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/wujeferuziruzo.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 10752 bytes
SHA-256: a4ee96ef6c4723a39ce7aedfc581f307dca1c5d935535ab4fc35ef1bd6d940e3
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 17024 bytes
SHA-256: e3379abf8aecadff8137d8414888f695f1916c3d92b8061df9c471e80874649c
font_02_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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