Malicious PDF — malware analysis report

Static analysis result for SHA-256 3528085db054444d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 08:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b49f9705895b2eac5dc8cf0ee74774af SHA-1: 7f4bfc8202f93f8de85d94b243b12a534d54f2e7 SHA-256: 3528085db054444dd38035673010af916e9e677e5bed1b462f5820d4083ebca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious sites.

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 http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ecec2fb2---94922306578.pdf In PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/viwej.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/33813629471.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/zujevakemowoxabopuv.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/sijebonejekuzimupevas.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/kolobisojuwoxos.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/xaruwezizin.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/leridalutubimalipene.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4cd7d98bb6580a5ddb19d5241e20795/16328042889.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/nopisudadekaf.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/tedipiwoxezigibegosizelak.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109101201554922519glt8gw9xlf3.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145548f579b8---31717413101.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/75379460025.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90920738479.pdfIn PDF document text
    • http://ibb-online.ru/f/file/94226790016.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/55493577196.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109140553035077.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/todola.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/13523168007.pdfIn PDF document text
    • https://gornjastubica.hr/files/toguzatipibiwuzumakajux.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161321a8d70009---sutajuwejez.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c84254fc---lujemawegom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=live+ghd+sportsPDF 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_off0000bb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2C 16648 bytes
SHA-256: 9bc313aa30becd71952a1b98b70ac358c1f79c004397575f49dedaec4669f836
font_01_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 10384 bytes
SHA-256: 1acd364b26d29cdcce206cd1e96a525c9f2f1f00401a4df500cf9cc03f02d4e1
font_02_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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