Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7693a4ec4fc469…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 12:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 878fd818ed37a51736181a10e82a7c28 SHA-1: 1eff3880d2a7f69ca2ea8287683d7695368c748c SHA-256: 6e7693a4ec4fc4696a9ea9711dd88dcf373086cdcfcae5a767555dc457f4e239
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading a secondary payload or visiting a phishing site. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mywayrtk.info/userfiles/file/55862158275.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae60be25b---mupojebo.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/zevibalajexememafove.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1ddaa1c09c358fcdb58984612b1d1366/36373571077.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zuboxadefep.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb645ecf---desuvuvufebazanod.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/reseditezesikawutuxuretus.pdfIn PDF document text
    • http://vina2002.com/uploads/files/lusuledubolazibemabajer.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/mugode.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/h4egte3acphn1ulpqi2rhi8rit/ropaboguvirolutemonematel.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/toxisujigupabulujo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071705e2f088---42840304146.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/denop.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/42644751804.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/96438810854.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/6180349970.pdfIn PDF document text
    • https://solturism.ro/images/file/jimusiguzaxevotelisuris.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/jonupubabiximimelirobur.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/tesofukolozini.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/15585508044.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c15f07f5---76348577710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=optoelectronics+by+wilson+and+hawkes+pdfPDF 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_off0000bb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB77 11172 bytes
SHA-256: e9a9e478e5cc8bbbe1ae2fb340b71d7fcbe0dc94fe858dba870dfc68888d6410
font_01_sfnt_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 16648 bytes
SHA-256: 75602c3e9c00f115ce8729079d5775ea05b6d0b0a4a8db60d741fe735a8b31b3
font_02_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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