Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae9882e7b571a26…

MALICIOUS

PDF

61.3 KB Created: 2021-05-16 01:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9055d9d74e8eb037c3d25e36a99ef6be SHA-1: a00cb4a7bac4108e22923b2e21ee86f9e61b14ff SHA-256: 6ae9882e7b571a26e5003d248131c3c1fc70aa4de66365c4521a68417dedc4da
154 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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 https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d389d8970980379eff44ad37aee10e03/5011931188.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdd391254---77597789511.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/447e6607280f48e9a00919d90ce99460/73747391167.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079629f4d2ef---60687613678.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pbdm2i2gebn787btf6cucl7hka/fevadudakagalogozodowuxif.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ncn03acg5u4rjc210sl208ila2/86958476247.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/eb0867fa80a29002d543be2558237389/18468179237.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0802f566bd0f36b80060b44b0727f917/2107614340.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094da5c77ef5---37312325128.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046f8c4622---bonetadewiguxogoxijazoma.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609414a652362---17776112819.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e6f84c887d07f8e12729f6926c17d1a8/xidebabiwade.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae59d5be1---nolixezepurofexolipi.pdf
    • https://paklya.su/design/img/upload/file/14245850911.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073dcf1272ca---93983279162.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=baidu+spark+browser+2014+free
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10d.bin
50c588c2d7c3d1df2cc8d23d9a1795d9a990235444520bb1603ffebddf78726e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5760 bytes

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