Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b6e6215bc7af0b…

MALICIOUS

PDF

81.8 KB Created: 2021-07-20 13:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c37eaecae89fbc520a0b6a406470424a SHA-1: 95e3d4ffe2d4c1c2b165bad5f0c2e39c325e8e90 SHA-256: e4b6e6215bc7af0b00c20597a5d453c458f06859be9271153a36ea8d0edb757a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Embedded JavaScript and numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggest an attempt to redirect users to malicious content or phishing sites. The presence of embedded JavaScript (T1059.007) and the nature of the links indicate a likely phishing or credential harvesting attempt, consistent with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://amoy-art.com/Upload/file/xegukop.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf63e348d9---22087984250.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160747e26f0cd4---jugovovigipekaru.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a391b6a1201ba43533327068630e0923/84148654410.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be6f0cd719a---26365210037.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mp28pmt2stmn8788ppv5840244/tovetejazodaxil.pdf
    • https://angkoronetour.com/userfiles/file/74744680612.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cefa6b9ecd7---tamoviba.pdf
    • http://ankurgroups.com/userfiles/file/fanevolumajuse.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a068cc55296---zapetitajosegibaxi.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bf8c793e---21075558150.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a6a4a4fcaf08e70589909726af8061ad/80493618962.pdf
    • http://slanfusa.org/clients/47225/File/26223421318.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/nuvubebiduropipisidi.pdf
    • http://kuppersbusch-center.ru/uploads/files/7648639196.pdf
    • https://digitaldaya.com/imagenes/file/13843427836.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072682b4aa00---newimebupu.pdf
    • http://bhk-aindling.com/userfiles/files/85008085227.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o75u2fdnrfp86ie2ch7qp0e4um/pugirixeg.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ilo8v0hiio2agdq10eq7b6r3bp/vozonijexo.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210616051309169986fvja6m.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pp78j791tflsh9kq7920e7tgea/rawomas.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c44530b06---nexejidop.pdf
    • http://kpghomerepairs.com/uploads/image/files/38362601631.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2jluh0t5rdk961g1vpnjp1d4uc/86554394451.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=introduction+to+polymers+young+lovell+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 16792 bytes
font_01_sfnt_off0000f45b.bin
02b528c836dfb607ae02de603ce5138c9563acba450fd14d73b61dfadd09e3fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 17756 bytes
font_02_sfnt_off000122df.bin
259da1b316da1c5897078135fc4a4fe68484c634b5b8e66f49af4f8d5858cab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 11032 bytes