Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4829b4b4490c738…

MALICIOUS

PDF

90.3 KB Created: 2021-07-31 01:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c04735bcd7abd9d00dbacb2d0104cfb8 SHA-1: 85fc3daa0cb729eb5b38a902c82d355b76bdd91d SHA-256: b4829b4b4490c73877e69c2ba68039a170d5a33daeabf698a177eafa90eae511
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • 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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608328d4357c5---rufobozi.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0a5154141cece775e05222ed5a45e8dd/37303719100.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4152ac3c---1961540905.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/78451985452.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/060917567339.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0c8afd77e11031be59145336c458d6c9/degejanonarupigegowobo.pdfIn PDF document text
    • https://mmszke.hu/files/file/gokevunisena.pdfIn PDF document text
    • http://chinazzjx.com/d/files/wobosodamiwixabolise.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/df7c029e050ec2d8f32c48ca13f89018/82712689669.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8c812dd8---lekudumofolugotujen.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/38472303897.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///watuxelukagisuxi.pdfIn PDF document text
    • http://consade.com/userfiles/file/narodavafo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5aa41b8dc93a5aadc28fc08cf97dbe6/64197978157.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/60409285533.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lifujabas.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/18727024143.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085151ec51be---24916999427.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaadeed034---wopazapupud.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5f5eb2230634ba78c774831b95e88c4b/26432918741.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/56299123306.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/57985beceab5312145242848b0036373/fewasepagexos.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e188991c5324c905a7d4e82fef486e34/fewikenojofedonenavopuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hindi+movie+mkv123+downloadPDF 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_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 16816 bytes
SHA-256: a1c5a4e878edee3a8b107cf384c9af0c043a53f8a56c639116b6dba78d8c1f4a
font_01_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 10620 bytes
SHA-256: 8471c979151f0e723e24742135c74cc234f81561d555288a408ec86f1537f2f0
font_02_sfnt_off000143cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1