Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1ff974b8066c83…

MALICIOUS

PDF

93.6 KB Created: 2021-07-13 14:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 770aaf7a75138a14b302a47ab304265c SHA-1: af012b669da9246fad9431b3aa8feb523c865e86 SHA-256: 3f1ff974b8066c83db40e8833af1098b1459aa7a356491d09448a6107a6507fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristics and URLs suggest a link farm used to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29d88a1fa---xawevojijigujimebukamarej.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c59562ad---vavewugopojagivot.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e600f06b58f---kibufajutabinujopax.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jipuzuni.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/birawanu.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/lewilituwuwaxalixowaxo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb9ac3d40---zekafotisawemovobuwawiw.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/rugemawawibisoseze.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a160d157c1---kibepajulelerubujora.pdfIn PDF document text
    • http://computerdoki.hu/user/file/97327926987.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/nakuxiz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/13eb7fa4b7d4daa84fea4b4ae99dbbd6/maxos.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/99287976825.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/kakizisegabutop.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210618140950.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082371b1faa1---fuvinoxifiz.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/nonekawaluke.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7930a26b68e9423c55207ca197ac621a/mavup.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076084340983---51781128009.pdfIn PDF document text
    • http://moristas.com/userfiles/files/87505311376.pdfIn PDF document text
    • http://ridendo.cz/files/file/16959931678.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/70860216381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=divine+restoration+in+the+biblePDF 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_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 17096 bytes
SHA-256: 0788ba3b13b585882576f8a2582465e01b679d929accbe77a8c4331796f1aa05
font_01_sfnt_off000139c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C6 10412 bytes
SHA-256: ca0b8a2042ac0a63024e1df8d497395f6d93260e4188f33efb3c7eac4715f063
font_02_sfnt_off00015159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.