Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc33935eacadd47…

MALICIOUS

PDF

84.1 KB Created: 2021-07-16 15:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 534391a110912f15d8b605a51e641db7 SHA-1: 2d0f700c97243f563988b61723107b6ad16d1174 SHA-256: efc33935eacadd47d8dbd23736b9f5cd86763956b361a23f20c36c26805f588c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised CMS upload storage and disposable hosting sites. While no scripts were directly extracted, the nature of the links suggests potential for further exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://romengo.com/ckfinder/userfiles/files/lifezibaxolujaw.pdf In PDF document text
    • https://annjulieskarpmo.com/userfiles/file/11294502540.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/duxabasalobegubugonalo.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/remitiwuvokazax.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/40121583886.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/90249805021.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a2ccda70---6160144681.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47b79a5d2---fujumetamom.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aa5127f36---pesomemunutinitozofefa.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/13949362467.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tuliwetufasega.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081720eecb07---92844210297.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f0613ff89095e03df9474bd7aa996ff9/nemipamibivazebe.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2d01d38686efa3fa38b58cbc3c66474a/pixelomutaxeto.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/16300329539.pdfIn PDF document text
    • http://phunhai.net/upload/files/muxubexavuxakonosaboxul.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/k4l8pqe5hc76q61i5fmk8tprdv/bimetowuleke.pdfIn PDF document text
    • http://goref.ru/files/file/36227442658.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cca76c3ff60---jisulekixilopanozezupap.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736c2dc96b9---30562910172.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f7a7e1df57cc402b32b757bf40c70a32/zirokujugel.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/raraxabux.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/goxezipuvim.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/texopodakuguxemikeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+a+lever+used+forPDF 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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10508 bytes
SHA-256: 5647faa7275193740c61a3ef170202463d551da4fbf3da37e07d76465303ddb8
font_02_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 18756 bytes
SHA-256: 9fcc7ca73ea10b77122e3029e6cc9b47b17578fb86833146e70e55381a8729fc

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