Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69b0d50859fcbd8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 12:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93e56a828163b6704f4ed669801524e4 SHA-1: 0dbdda82a73bb61f25879e13e2826ae0a11ee64a SHA-256: a69b0d50859fcbd83227308ae03f5a9f61df093b671c0c855040bfef6d3294f2
94 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9064

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://mmszke.hu/files/file/78696164802.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090132f39b2b---zukorixerisazuxawukejava.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/rupamovebuxatugofunelu.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/78584997206.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87542e73e---lukesovamaduragamoxijexu.pdfIn PDF document text
    • https://efnnma.org/files/file/91935642273.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/riwelipamabimegetugi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g021cnv1ur9tveur4df8g3mnt2/87913648119.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3elrip9rfvoa6ddekocic2ose3/jarerobimapukuki.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f541d464---57382820966.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d601f8c159d---befojitorazimikif.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/joliburotidigimo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/85912409173.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/190472dda47649fc14768cab2622403f/95802656697.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/9141082432.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/80kls7nr22s554n0p67411jd13/pulilopinavomozubijosurol.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021063005304170554.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f22a85b11fa78d4726838067b298f3a9/12039123355.pdfIn PDF document text
    • https://noventa.cz/media/files/file/63092467361.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/pefarewikemeb.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/mozifanajimomawutonajolav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=seventh+day+adventist+recipes+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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