Malicious PDF — malware analysis report

Static analysis result for SHA-256 0543e38b6678de40…

MALICIOUS

PDF

81.7 KB Created: 2021-07-18 19:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa047252c4191e92235b602114d1cbed SHA-1: 05426f4ab9b2623d102a71a4273da8706a5c5e1a SHA-256: 0543e38b6678de408c98f6df5c6f0ed131244249e31ecf8cd483ea889a711a8e
124 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. This structure is indicative of a phishing or malware distribution campaign, where users are lured to click links that may lead to malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

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.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160942744b0051---wojeposinasifojo.pdf In PDF document text
    • http://netinflux.net/userfiles/file/61887046848.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/76488857261.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/97607370381.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/sogulozebanaxivijulatuxa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0me4baearjkopn1v3i384ugk9h/17259591678.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b31690360a4---97944729705.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vomiraz.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e4ab95aa---wufapijaditu.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/sepazorosofaja.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ua66g2fjuc42g8184gkrdu5c4u/zupomi.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/4ed84b295405b93694043e895a7a6e43/49374227524.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f416dc6b645---34690573623.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a410643c252---6018350911.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c3090fbc---82880027175.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/lojosuduxazadawi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/kizuvesogezusura.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xasurulepumesazagulepi.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/51d342ad1d8e07e96095a69b3a0bee71/viraxulewawipen.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b9600249bc940c3b00372cf9a1e7295d/71770028153.pdfIn PDF document text
    • http://sns.hu/_user/file/lolamovominuminudeboweted.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264c7094f---lokalimokesepisabu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nunebak.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/domg8aaebcs2582r6t6977ul4c/goguwuzuvodebabenewa.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9b0109cad9b1aefd6795c1ff2ac58972/sejafajesiji.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bcf1418580e4c881203c0ebd3539bc1a/wenasapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chronic+kidney+disease+research+article+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10952 bytes
SHA-256: 0e8a8bf478f278f81793081e17d109a06e7232ff39d614fc1396b29c88f64531

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