Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c40bbba2157956d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 00:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c00ab6ed82636466ddbeffd28c590ade SHA-1: 63598fb4d5feb79cf207156bee0739d80dda7ece SHA-256: 3c40bbba2157956d186422cd0ee965fdc0b2b236a98474739d0e42fac1df2bb5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload directories and disposable hosting sites. The embedded URLs, such as http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc487628c5---dujowuxozapofoku.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/faxelutopozenevedi.pdf In PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/4432342078.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///dijawiposomip.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6231e137---fikuxofa.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/32166107596.pdfIn PDF document text
    • http://chinahongji.com/d/files/66035584126.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/76631474190.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/21754132304.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nataxojukibe.pdfIn PDF document text
    • http://eichler-kammerer.de/61119107027.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/zilomixev.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/rabebobaxunazi.pdfIn PDF document text
    • https://tivicom.vn/upload/files/pubuzolo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc487628c5---dujowuxozapofoku.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/sutixowudezawi.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/83550130569.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910014715.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346900d98d4---fikizem.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zegobapizusa.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/19182711196.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33668bc868e0302fb8ce5fde3ebb2164/49441826895.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/diguxiz.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/3267383154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+check+spam+messages+on+androidPDF 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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 17808 bytes
SHA-256: 3151a6806f708f79247563129cf0e6b35b94091c4d0331c6e54adbc95d71e463
font_01_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 11084 bytes
SHA-256: c86ca684d6e78a2a25e6eb11475faac2376540a8d26a4348d8fbd8db9f6ded48
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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