Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c8ac3aaa6b29d8…

MALICIOUS

PDF

62.6 KB Created: 2021-05-19 12:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f88172e0f17e1d62c9c9c561985fd759 SHA-1: 022daaa6b740d2bf5591fad0477cbed54f032b65 SHA-256: 88c8ac3aaa6b29d8c3fdc4470eff019350b3ef238a42c8db57883a11dd782d92
154 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. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, suggests a lure related to a 'dictionary of synonyms and antonyms', which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8552

Heuristics 5

  • 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
  • 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://daoltrading.com/userData/board/file/54386168576.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824116c006a---ponamutusajupiwovoburokof.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/883e8d330f3113c0453cec3a3b18233d/perowaliba.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2b9fkt1kbvcv8mann5ck3l34ar/72457697651.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960bd90a07e---buxajetawutus.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/424fe6411013788b411ac80e9c7714ae/90005901489.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/7d2o17uflv8sdps5g5pjtht4a7/rumasaxaj.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s05fb9qvviaar6oqvf1oo24t40/tixokipanivanufuteva.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607349684dae0---madobujamanexise.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075de52d9b71---1567445909.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s38fnnb7h7la522maqndp183pt/saxagupuw.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a8a2187202089527d652d0ab1b46f05f/wexiziranukotu.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b1aefd3c---61208955842.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48b842cd0---67002584043.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/83dtp5h4slfr2hs0iun2esg66c/disuzijevikesebizixavul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=diccionario+de+sin%25C3%25B3nimos+y+ant%25C3%25B3nimos+rae+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25c.bin
e9251faacb82cd1ad678c7ebeb384572bc7f8ac124f78a84f5413996f994304e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 5296 bytes

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