Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada75e8ca4bf59b7…

MALICIOUS

PDF

97.9 KB Created: 2021-10-26 09:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ee8e42f94b9095fcb0fb9b76c53aec9 SHA-1: 6d555b36c30fd623ef1b536ef1ba0772f85809a2 SHA-256: ada75e8ca4bf59b785242a932f1d428bdca7e7dcfe2bcd6c71a54f43a88a020c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. Several heuristics indicate the presence of a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • 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.
  • 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 http://baobianhkhang.com/upload/files/doluluwekose.pdf In PDF document text
    • https://censcakmu.org/board/file/files/77747889042.pdfIn PDF document text
    • https://ghnservizi.com/file/72363978038.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9f2e4f46---didepexudusezizozuzo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a45bcf730a90ee0cf319315910667f7c/jiravoxorameduxowojig.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/fazogafemazopogoj.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/wunimulajirekowadaw.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2edba713651db812d8beb9c40d0d5bf7/muzirufekobovi.pdfIn PDF document text
    • http://ed-union05.ru/files/file/22501946858.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53d98a749---98612882560.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210901203058_wxzz7u.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/gavigiva.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/mugosasunupibi.pdfIn PDF document text
    • https://bak.vn/upload/files/60276598593.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/remiwofodojip.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/kaduwugarulut.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/32646665489.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/45339232738.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xepinosidazinipumidam.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/puzamipiluno.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/62337083035.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/40635391110.pdfIn PDF document text
    • http://korytnica.net/data/files/83307286156.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/gasatiwe.pdfIn PDF document text
    • http://hodori247.com/uploads/files/gijadasumepabiruxu.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/lujinenefitowelepuremav.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/parogiletopap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=when+you+are+old+and+grey+and+full+of+sleepPDF 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_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 10792 bytes
SHA-256: daac79ebc5468ffe3fb02f6c15012588df6b25df3165a4fd7dc50a8e0b1176b7
font_01_sfnt_off00012c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C21 20424 bytes
SHA-256: 71a33a9ed484179541edf1496c8576b6b2498e6a20ad8749df01d1cd72c82b61
font_02_sfnt_off0001611f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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