Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1583798a859daac…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 01:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3f82a219ca08e1b5d8371650bd30e1f SHA-1: cf0651edaba86b045b084bde2d8f5c00f7ee838f SHA-256: b1583798a859daac0e8bc0ea224cbb5190114dee8fcf733064f526bb6015fafe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and the use of UTM parameters indicate a coordinated effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a6bb2c39---menamogeli.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/f1p02pbl253chtfk9si96bcdmr/63814703418.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f92a820c---26237756718.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c49488b0f---zadadipo.pdfIn PDF document text
    • http://falerisztika.hu/tmp/xavofezu.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/mojaj.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512120517744964.pdfIn PDF document text
    • https://schmitz.cz/res/file/10936007889.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/dddde250949b564163eab0469eae4399/84358106519.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/33798899204.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/22321507518.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcee53a08f---begexiruliliwuruxoguner.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/xobakepuju.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/xilorili.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/golovitudanepotowenagelav.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3822def64---kitomofijapesama.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/39452586425.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e6bacf6f6e93dafb163a215e3e519b93/wotiw.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/moxewumomarixu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ea5c10159---nolul.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/3734985766.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/xipuvekoxipimuten.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7ea99f8665ccca8f7e48e00cdda51774/fupegenuxa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612988f78536f---17038301042.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bukozuve.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/domojoruvemuxona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=if+conditional+type+3+exercises+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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 10952 bytes
SHA-256: bb5311166c0b619c0241968519d7adfbbd89d96cc590386d84bca8fd02266d5f
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 20704 bytes
SHA-256: 08887b0a305ed9c12f5fbca17c885969f61e5dcaace97e03a8d3d56c75adf79c
font_02_sfnt_off00012b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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