Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f8fa679d6ba0e7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b34d5e84cb9a3264b7eb713ba3938d57 SHA-1: 9ebe2da45246b876d076f5871b909d5bcbd5fed4 SHA-256: b6f8fa679d6ba0e7a11d9a97bfcdabfd491db5984d283631b5e48029382b9557
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://cructi.ru/uplcv?utm_term=preview+messages+android PDF link annotation
    • http://bowie.abwingsmd.com/uploads/files/wotasizorazidekovazul.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161329c7327c69---9019534660.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/91692623369.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/19684226324.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/12364948035.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/fobotagibedipapim.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/97681830272.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614430638f7df---foroserumororusun.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/13977027911.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210916_154626.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/73978538688.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/csh2km4hdqseprg7809vc2a902/18590047500.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/30289766233.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/resitor.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/jatidebo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/kawujifukokotatutomakel.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/penorubumimifipirowuw.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/bofuk.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/57787284711.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/56419436307.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/90851813568.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/94192434290.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/4580561631.pdfIn PDF document text
    • http://capital96.com/userfiles/file/lewevamedalopifuluwu.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/32442414947.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_off0000b5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AE 17412 bytes
SHA-256: 2cb343ffe6ce873b77bfaf9201995d705d032f3f90835adcd61706adc5e458f0
font_01_sfnt_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 10600 bytes
SHA-256: 4268447c62a8ab30aff4a3ac7dbffa88ba0e55ef4a58c016dd147d17a52fc4fb
font_02_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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