Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5830bdc36060857…

MALICIOUS

PDF

68.0 KB Created: 2021-05-27 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15fa91c4ef60be41f0b902f331ecdf83 SHA-1: 17e91473fb31e84b09f7a1e59778fa8a1cfcffe0 SHA-256: f5830bdc36060857ad591c744b503dcc0a61578c7b757e0b6135013ea765fd75
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though heavily garbled, contains text related to watching old Turkish dubbed movies, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc148da6a---41153547397.pdf
    • http://amdind.com/userfiles/file/1467239866.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5sc2pe1n4atic3iqnpk36ivdi7/81040081813.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jk746pav02h7u60ou8kldhn32o/jajewurezefik.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/070b13666ab2321b616300dc01996af8/porusulaw.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b516b7ca---43709549485.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1853cabe---vulapigodinaro.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gr659lchjmnekgv2eb7ra91c3u/59977084448.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb70fb89c8---46673507872.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894e78e8b77---fabimufu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d989ce8e48---25043120634.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/336ae0f30f7830ad9703bbc5cb6d5add/37547874944.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/rmqf6j6l63sqma8uvdtuiqb2eb/91559367243.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0b57f6e5cf2da82a47328829408e1b5a/93243482622.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d521587721---11866165684.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4lfoqb4hk66ah3spnit2prd4v6/18100913352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=eski+hint+filmleri+t%25C3%25BCrk%25C3%25A7e+dublaj+tek+par%25C3%25A7a+izle
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b3.bin
3697756b73d1a022ef81211647efed7a3f2c5ad52df6db374c8f91ff17432fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 5868 bytes
font_01_sfnt_off0000e45c.bin
0cc2e122df7ee7c22e82e5f592f80e881ffd5483efac97978e4ad15c0e6207a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 11540 bytes

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