Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae86849ca89ad93b…

MALICIOUS

PDF

74.0 KB Created: 2021-07-29 13:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4fe2f7ebd142c4483f2db727dddf5e69 SHA-1: fcbeb3f72552e067b2ed655f11499b51facb2552 SHA-256: ae86849ca89ad93b90ad98b6bdd697f3313bd01f16f954b6fede602404b71642
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to host and distribute further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ecb4c341---63591523805.pdf In PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/buderunagenopenelinevunix.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ce28c5380---23719189231.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3l87d5vfkd2ktsqpgln2hhuqr4/60361336792.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/tudasuvojozifexev.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a178965fa75---tasutakolobuvivog.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/52931336905.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/nilivibiroruzimoridun.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/ronodixudapixizaxunedigig.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jarel.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dfabe146f---91900103936.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f12f3bc19---momowodunigexoxogat.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/sanodinodogokibuwadizi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1nbcsppvhcf1hmeqahlrkvinh0/47775389110.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/23251617933.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/juwofezaduxurowodakigek.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/84e8cda2126e71f466b53b348c3d6c0a/donewuxekabawikovibaneve.pdfIn PDF document text
    • http://axwelindia.com/uploads/61110070531.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/82540985703.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/30111527772.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fejupovimifexog.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/59552262716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=borat+watch+online+english+subtitles+freePDF 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_off0000c01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 10992 bytes
SHA-256: 86f5c1d5cdf882580a8d3d78197162a0e7c54dc2a702e2a7b3e1bf3a82d2d5da
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 15468 bytes
SHA-256: a059399bb468cd98c98af594508694ba8027d1fa28623b4b0e4d5da0441a01c0

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