Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b75f733f5a91ee8…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 07:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 42e1adf18fe10b32824d7a83192aab76 SHA-1: 3ec0bddc0ae0942a077c73f12e347c056bac74f6 SHA-256: 8b75f733f5a91ee825cf00b051434fd3e882749d1931eb2007abc9e32841efd8
64 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4675

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://eqonetech.com/upload/userfiles/files/fanulewolufegibumeper.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/34ed3b7e23b40cd4bff8122a636a19e7/pupisopim.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/mesisubizuwo.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/43740753001.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/12326507686.pdfIn PDF document text
    • http://markone-tools.com/upload/files/ledigekupurapig.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/69558222022.pdfIn PDF document text
    • https://jagominum.com/contents//files/dadezawirokikegideluxuxo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7548630bce---8998796747.pdfIn PDF document text
    • http://jump360.co/upload/files/20210604135254.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/minuj.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/65439414933.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/77608996788.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/rabodesal.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510132576089.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9f1f93597543d7da5821eff2f7f1283a/rowatumafuzet.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ad024701---64104766557.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f71cd1043---wofivibomenibipidedozijo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89abd7782d---toneluxujadisewat.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/kubadapimunexadeja.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fd36d859---93944894635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=php+and+mysql+interview+questions+and+answers+for+freshersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a46192e473d909cdfd010565dfa49f49/garasasurupujevulajata.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 11276 bytes
SHA-256: 13df1520778c89e93f1b3324ff7fc531a8668c5aa61524e06e7abc1459628978
font_01_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 17792 bytes
SHA-256: 1a468ba3d8f029da778e3782aea646c5e333c4ff24f4e66d6d3cb11047bffbad

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