Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93727638d27fbbd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 13:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6b062544f444cd377eaae94870551d9e SHA-1: bb8a58aaaa163663efcecb504e5c02c2b9c15189 SHA-256: c93727638d27fbbd01a81246e90fd96708cf7676ad586723c7aa73fb9bde4b3f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings confirm the presence of external URIs and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2rnis6s217k3u72hejkbk2k1fa/nuxetupowarenebitiwadib.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4dfad026a1d83441283e33432068637/xiveberozigavove.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/3551428477.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac9d7ecf8---fuburabaredido.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb6be5dfe---15762699896.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/99493073510.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e4ae830259b98322b551ef2ebfac8da7/59339942823.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/ketivexaxosede.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/25706397594.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f3a28daa18ed01051be9616d3def07d3/30884239690.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/sarobisakomipajixisokof.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06dd0cdb1---73828786947.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/jejatato.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f7479f41---33635594994.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795ff51eba6---biteforiru.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210813185317_830479819.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c517b369d37---godiguwibazepu.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/sorexiwijawawuxomeziriw.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/13274402847.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gexapemabaraxo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ce7193dd4c75df902b9b3c2c2df2fd58/begeromivofebatererubeser.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/dinopigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=take+me+home+country+roads+hermes+house+bandPDF 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_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 18140 bytes
SHA-256: 18fbae186f1b0506311c29162b369efd217edc9db27c20bb56bba94640cd5224
font_02_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 10908 bytes
SHA-256: c9077e086abd62ebed3ffc13efdeb9c9ed0b685f34fd3a528c3f60d94188ebbe

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