Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9300e66f0a61876…

MALICIOUS

PDF

87.9 KB Created: 2021-08-14 01:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f4bba47e7c5f8444f6b58bd8c9d1f32 SHA-1: 2bb5a5058ba9589f76803031f5ac52d8f172aa36 SHA-256: c9300e66f0a61876c168af1f6edda815f3f4267fc506f1440f3b8d42a82e1c31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://camping-du-lac-dijon.com/fichiers/nupagubom.pdf In PDF document text
    • https://capecoralliving.com/media/file/10580904095.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/79055339412.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c6b963d6c9f0f1f16ca2506f97e7588b/wugupaxazibuwixorugewumal.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/11527517488.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/wurosokel.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/komag.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d450e95b7086942b0e7f47600c275534/fulavukutixogegozu.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/jajipiwuxitusisasidodabar.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/sozimuforewepaduganowitog.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/nerid.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/71666548360.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac00216d1b---sanamexidamuzibe.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/pudukataf.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/pojugek.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/bopuverufidebezozagixamub.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tuzabuwuwimovoliwurikeju.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/39068163734.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/84604233186.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4af6fb17848d6e5bbcc40a98885831f5/xekoxomo.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/12463447567.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///43972401742.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6f1cfbdf---zategafivibasedegul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+play+multiplayer+in+lokicraft+1PDF 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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 10908 bytes
SHA-256: 66ff5f2f86361931ade7021d747dc87751a18d686597f22f900142c830951d19
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 19256 bytes
SHA-256: 5751a851ad9d0dba02e2257e8d1adef5e64e7d400cedd5e78871d76950d6834d
font_02_sfnt_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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