Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa7ecede0d40aae…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 11:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34f63c319c8acef18cdd7db0f6a21374 SHA-1: dcad92d109472f321b46b427fa8434f61be86df6 SHA-256: faa7ecede0d40aaeb29637dc84c629ea395bcbb4184beba36e3741eda43987ff
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9de096861817ab9a596e058608086b93/jepagux.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e30062218c---12133648266.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a5097eabf18---82388724952.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799dda46d23---55910719975.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62d82fe2c---ragotaraveme.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760087c1ea8---xobukonifub.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608439ad74e26---23176398334.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba5a5cb01---27374901026.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pl6jmlq9ji24edjpphmaio8gok/wezokotiri.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/kgbj086jth5njp19anuaj0c49b/xodavexugususuni.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/16fb80887a3ecf3b91bcae5332577633/susalu.pdf
    • https://meesens.be/KrMee/Tekstverwerker/69873412292.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1480a3b62---gerigu.pdf
    • https://appvid.eus/userfiles/files/65546311597.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6ghpb3r3p21n0it5v9ebmn6rac/4988942703.pdf
    • http://darienhigh69.com/clients/866565/File/51093014868.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dlfj6tlhutt2g8rf428s0kl06i/pedavuko.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a44f80748---1211013500.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c9t5ut2f9gdbgep5pud2gl43c/69473710464.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde45d6ab3d---52922418583.pdf
    • https://amrapalispot.com/userfiles/file/80482097674.pdf
    • http://edgecs.net/documents/70701833902.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wildfire+in+his+arms
    • https://medlineplus.gov/wildfires.html
    • 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_off0000f084.bin
76badc870bd55ece4b83255732d84ec5f66d17dd62588b0e15b11a0e55e1cf0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 17128 bytes
font_01_sfnt_off00011d12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 16792 bytes
font_02_sfnt_off00013529.bin
5b3c8a8c9b4da652a21dff41578638035b025edc11e7203e5bd04ca9e769e28f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13529 10396 bytes