Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c89e7b0c72fc73f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0c28389edbb20a1d1698aa60450c010 SHA-1: 5cd0aaa409917ea2e65fe34f21f33a90585d3afc SHA-256: 2c89e7b0c72fc73f86cc74ef0f60707e2e45cb030b2e86be89f6a49a03bc52f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it's designed as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs point towards a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=cloud+analytics+with+google+cloud+platform+pdf PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160910978a252f---83716406512.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/30209977690.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/udui1plg0hvgmi8nh1fun709b3/3156270489.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zotapoguje.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/nuwibejiranaderiz.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0966b4199dd7f4924d26bdd4ae0d197a/zogopedobufevuvirisum.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33823c97bddc4db2d040c79348a28370/21091004340.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/fipivebirisafoweke.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094840ce07d3---bojaduxalaxigonemexed.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/097e0238ff3d04ef080c52241f9f964a/86468909108.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/lukowaxogu.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/zegitapazedaxigo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c156457548---31381021470.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/lefokefegixab.pdfIn PDF document text
    • http://scpt.it/userfiles/files/basotejotunovejanofe.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9549a00c94---14231298758.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/94219439117.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/69278810002.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/17731383818.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/22854023652.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/32974200885.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/sogujuku.pdfIn PDF document text
    • 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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 17772 bytes
SHA-256: 0abbd9e318500f3e9cafef191cf065ab2222f4621b46918c83d89cc4cc813206
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 11400 bytes
SHA-256: a4919c184e14fecb6a0ac48cedba0acf58c93794e9b9852feacef5666048df6c
font_02_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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