Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef29ea123223fd5…

MALICIOUS

PDF

78.5 KB Created: 2021-07-07 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cede3c0ae3b36cb491980c0f993e2ca7 SHA-1: cb6431be3fb4400844691410658d805d5b14909e SHA-256: 9ef29ea123223fd521b3fbcc6706db080582283c6c7576e275eec9a19711e51b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16098c38bc3111---jatoruvajavevatebif.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d30a6d5b4---9791313684.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5dp921hmfclurn2l3o6hsbci7/99947935142.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160989eb757db3---lugipuwupezapinubed.pdfIn PDF document text
    • http://lawngo.net/fckfiles/62669974246.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/gajukatasavewadujuj.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c3846a0f6f69a138209a9265b4e0d113/jinovebizawifazobajojil.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3160f6cef4---mizonogo.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/75843774602.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/jbcul7e6merdh9pea1mlptb3u9/pedupal.pdfIn PDF document text
    • https://aashianarealty.com/file/wilirutera.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/devunowexafesevam.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bea1a1a72---59450948779.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa3db836e---35545602812.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/gudikifabejepeso.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2ebup3gkk94qaj4e3iqo5k2uo4/33351792560.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2d60c069ca590d79aadfafdc331c7cf3/31727304725.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/31c9f5734d7542512318c1b4ad948942/nebaxalelukumedewamupexi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510030307015.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/89893575443.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/38966354546.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/xomifubasabof.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b06bb33779b---gemonum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=handbook+of+competency+mapping+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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 17468 bytes
SHA-256: 5c65eeb34dfd4be69d6e354ac677e95d1f3f8764677e31882a0c9a88f5348dba
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 10988 bytes
SHA-256: 6c31e5e7c4809e214f12b4a5882b345d1c511959ff892d9597b411b581bdd5b4
font_02_sfnt_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1