Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc81ad595f3eb4e8…

MALICIOUS

PDF

77.0 KB Created: 2021-06-18 15:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b43cb9a299b33658bc9e0a8b9ecdccc SHA-1: 13158711971ce775b23cb215e7acfe170a2696a3 SHA-256: cc81ad595f3eb4e84e06e9c880a01d3c47d457aa13964558ba6d508793a5507e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=the+departed+online+streaming
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f59474f61---ruzenut.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vapuwuzunanabezakalaku.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/11932ddd7affbee98a7469b55365c9d1/tagab.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c645c38af5b---fefananijenatinew.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/62804559100.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ovliv8dnpfjeqhmh9qjljg9t42/63974343328.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/c0dab581b7bdb0420865e2634cb163cc/1647250230.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e219107500e110bc30046a8f107b4bcf/zisefuzunusifijuzeletix.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714dfe7b364---76003514389.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0b604da5---rikizuzetabomegatelawas.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094765cc540b---nifuguwikexefipojorum.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ihjjlib1svtbh9644po9o7vo47/sosutediwuzowodupunoz.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c510543e030cc07af47c6989efda38d9/86994912197.pdf
    • https://aviseco.ro/userfiles/file/nekajobiwujamoladasudiliz.pdf
    • http://blessingsngo.in/userfiles/files/webanojonib.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c0ae64ed41e6cb50bf7181123dc18574/45714044324.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f0.bin
ba14341b83fcfd76d22f514ad835b41479772066789b15a6a8aff81ddf68ee2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 5108 bytes
font_01_sfnt_off0000f418.bin
1d96b78f8ff70e8a02957b84562fefa1b9c76eddd39fc1fe02aacf9e0270dd0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 10916 bytes
font_02_sfnt_off00011933.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 4324 bytes