Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fa710f5b4fd271…

MALICIOUS

PDF

55.8 KB Created: 2021-05-10 04:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b69734a47a1e4376ec71cbae3a6a26 SHA-1: 612d5bca8cdf51ea2dd69d673f46dd2df866bd41 SHA-256: f1fa710f5b4fd271743e42ecac652be7fdfaabaeefac8a9f615dfe7bb2393782
94 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier also flagged it as malicious. The primary purpose appears to be directing users to potentially harmful or SEO-manipulated content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8787

Heuristics 4

  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c0d77b7058efd13616cc1fff58008d53/jevum.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937317b53f---lalibedo.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608425c1268d3---lidurulokaw.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/69652be838b12e3f6af0a712401e9d8b/zixukufipebovetono.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca915e1ce0---32528654456.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2201bbda---68220568412.pdf
    • http://aarogyamedico.com/userfiles/file/41634577736.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67724137738.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/82qbp378ocgib7ln6m0vurejqq/mujokarefuwuredapego.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1d49d7bfe1c85978eed5562f5774c2e2/88344359461.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd24ae50d0---91274394438.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092a10faf14f---88888086750.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/25lg15sact1phs38dbhhoqrons/42022752935.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16085e511e062e---11630644738.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7c2415d9---kutakamadukogokoneguj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hair+clip+display+card+template
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8d.bin
8af463b511610b52350830cb4823dd9e650b74748f436c5c6d09c049a9f5a5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 4852 bytes

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