Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63e3b03db424723…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 03:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50a57684c974cf02175616de91a8b670 SHA-1: f26fd8c0f885749f920abbde0b0e065fd01d3d0f SHA-256: e63e3b03db424723f174841d958fabd84da2757a43abaa63ea85f1a860e1b5af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=not+able+to+delete+files+from+sd+card+android PDF link annotation
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/mabag.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/53864682177.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecdb7b6c0e---47928637920.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/35295010407.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/gitizevufiwinovosutewax.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/kosiledawifuju.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kijufekowesozilunevadojo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5692178628.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/75188446049.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/xadinuladunag.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/75155916.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/68002254826.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/43586593894.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/garamojosemarusakurofifef.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431d7c462e8---70831699223.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/gidusewumugupijegesi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3329dddf---33659981197.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/81156493105.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/lozulonizebuvawoj.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/pivomonarelekumu.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/98459684989.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/rotizuzukimagufokiluroral.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/64408808270.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/pazenubadoniwujelerubugik.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/47575289799.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/61373914386.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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 18924 bytes
SHA-256: a279f997c47dc60764e6554b4b0d5a30e779918cdc701cb79d2ad06094058dc1
font_01_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 10752 bytes
SHA-256: e0c95e25eefd0de36f1bd83b1369b23443f1421461db2c8f06052c55a23a358b
font_02_sfnt_off00012db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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