Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb68e449207d1c4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 03:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f7607536d89f25fbf86f6847a9a111e SHA-1: 0ccdbc48c568acd90c205e70e860dd820e6581a3 SHA-256: 8eb68e449207d1c40d34664b0a358bd4d583b916f96ca2720e5d9fb8ee2ca579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. One URL, https://garglob.ru/uplcv?utm_term=kick+the+buddy+game+mod+apk, is particularly notable for its query parameters, hinting at a potential lure. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://garglob.ru/uplcv?utm_term=kick+the+buddy+game+mod+apk
    • http://runhouchem.com/upload/files/96824243624.pdf
    • http://wo-kop.pl/userfiles/file/zilozejigixamagemupes.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/57575647915.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b97dcd758---78728197510.pdf
    • http://www.nena-artspace.com/ckfinder/userfiles/files/wutudepadenap.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c7ed11d5---97349279335.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/35107843742.pdf
    • http://syarmarka.ru/userfiles/files/45484877835.pdf
    • http://teplorium.su/userfiles/file/foxatobesepofupimadaj.pdf
    • http://ilkemymm.com/image/files/manipidi.pdf
    • http://5lovestartw.com/CKEdit/upload/files/saraludoz.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1b1145bd---bazunato.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210924_FBD95A5F9103CCF6.pdf
    • http://muszempilla.com/files/file/neleworamudimozefo.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/sugagobaf.pdf
    • http://bienbao.org/uploads/files/89595920860.pdf
    • http://russia-ex.com/images/blog/file/sogumuwijasitixo.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1b62d5f5---99644001792.pdf
    • http://jl-vacuum.com/upload/files/repixekewivivex.pdf
    • http://cobmedia.hu/include/kiwobesarunarosikagajerex.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sk5j3m7muvigqqb0v6gmq841q4/21976158086.pdf
    • https://yogaspotny.com/userfiles/file/laxosojubupexijisu.pdf
    • http://proallprint.com/userfiles/files/muvewabijefixexawotexe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b497.bin
d8de9effe8f0fd4429c037de405f06762571a3c85bea50c4bd6e590133abed7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 10980 bytes
font_01_sfnt_off0000cdaf.bin
c129de17c8344ef152c17a0ceab914f8bba7ece2133f359c7a97907ea1594505
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 17660 bytes
font_02_sfnt_off0000facd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 16792 bytes