Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af7e073f93095c4…

MALICIOUS

PDF

86.1 KB Created: 2021-08-04 07:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ba7cb377338930393b09af9e4b454a4 SHA-1: dd01ef210589b654e32f9a5d5945e5b3ebbe1958 SHA-256: 2af7e073f93095c4e0d7679430c4a764ed39b4bb5931c0adeb45ebd4251013e1
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a multi-stage attack where the initial PDF serves as a lure to download more dangerous content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b086d0e3754---nuwexipotibavapitimip.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f96b942a---tedovixosakesabewavinil.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3qteesutj2je1aaq9tll8e83pd/64364676991.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fe510b1c72c8dba12321982564c11177/tigakixevidefa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ritevale.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/3522051073.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/23083649874.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/42817499919.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b22d0ca93bb0aad2ba0cfb985e1c7f6b/16384154431.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210701025800.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/02fba038c90d6467d70b37ac2f1c70d3/8390613331.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63dfb8802---wodenuvuzatunumajarimepik.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/96c2cba4ee90470feecff70ae94d1d51/fanubolarowewase.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/45633718386.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/770a1d76bb4280e3ce643295d9ca9f8b/49478946379.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/98973578082.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/23ec0e670d2316ecfb424523b8ec177e/vuganeviwofelix.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gijupinigivo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094529b101e0---nitoferewimukewava.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/sefiraditeroma.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tetisuwig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2-8+skills+practice+literal+equations+and+dimensional+analysis+answer+keyPDF 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_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 17908 bytes
SHA-256: 4879969cc338f849c80bc03dde551f7fac985b7e54441e9618c789f4e960b5b7
font_02_sfnt_off00012ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED6 11476 bytes
SHA-256: c4bd6830febf2b654b551674dbdb85cd6fd9ebc076f4ecb3b5abf641818f0363

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