Malicious PDF — malware analysis report

Static analysis result for SHA-256 187ceafe43d291d2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 13:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9147288bf2e71d64317e69d28515871 SHA-1: 22c67c0609446ffdd0376319309a5f31ff3f9dfd SHA-256: 187ceafe43d291d21014514a8ac16486b4e4e9b6cc83b8d797ef5deeca522120
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious content.

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 https://greenfins-thailand.org/uploads/file/95020807574.pdf In PDF document text
    • http://carrozzeriardue.it/userfiles/files/90099263344.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vrqv8jgb37i23jd10flo0hqv7v/jevisavusejujapoj.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kuzuforuxil.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/96556632264.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0137c6c9---fupevikix.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/lebidinenozafe.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/6eabdeff13bb365d85619d18d49f6fdf/gupax.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/71531088771.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96e15a765---kokirimenu.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/97138252532.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/egsv2243d101g9v33qlgcv6153/pugorexugutuxubusenejotir.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/dbddc83cee7d1252df615755d6e8106c/61096217286.pdfIn PDF document text
    • https://edarky.net/data/file/gixivuviwixesenuxixa.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/lenofogibufewepofejobix.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/8031614003.pdfIn PDF document text
    • https://energooptima.hu/upload/File/14624638641.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/sexadefexi.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/suzaxafaxuguri.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cfcp7kcap1b9fpu7gkgmp681bl/xudoxozilabidedurositu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ur0m72gjtooh9bopd5plcm9el4/fewakog.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/nexaralilevopoted.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/50183455164.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/27947582652.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/vukopusujomonabod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=architectural+working+drawings+pdf+free+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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 11156 bytes
SHA-256: 3bb3450e6af265613469ac06af20fd03db10abf24d94b0e347811792a37026c6
font_02_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 17816 bytes
SHA-256: e7da9fcf8b6bf1256234455495c2e2ba718e8e4c298c2e4a2ea06ca9999f8a90

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