Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ab5886085a970e…

MALICIOUS

PDF

76.2 KB Created: 2021-07-07 09:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 782c9b9488dd6548ef75d8418aeb0de3 SHA-1: c2fddfadf3593d42eb7510a3173921e52ed3d974 SHA-256: 91ab5886085a970ec81f895204f408d3964349857567a508f268b1514ae8ca1c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 malicious score 0.6966

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://synerhu.ru/uplcv?utm_term=proforma+one+solution PDF link annotation
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/gupitox.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/bibiwurujuf.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/tofabuwigurupodupovu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e225de3d18---90648490147.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/wivuzedalisuliwafe.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/32500422436.pdfIn PDF document text
    • http://starsunited.at/upload/files/digalurekuvixisibulinu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e3bd061ec5332c8c3388d0fd36771461/43255904535.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/40652781093.pdfIn PDF document text
    • https://securitydm.com/slicice/file/wamixibizopitenuwilazusi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9d6a4954---wetipogavikizunusa.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be02649dc---kazujapiwu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c30966b99dd---wijefufowe.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070503aab83c---sipuneramosuvorur.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d894477acecbbd961985e38028a70995/36032976359.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/9748180725.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a283688e1---mumirizidapaduseforoda.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c67642fbc---pogodubesogekivuva.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/berizigajefuxuvedikivat.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acc1d70c---14893923084.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/49228592927.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/70848491491.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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10476 bytes
SHA-256: 0e2855e367029d78f080231bff030fb9bd8e89c3433de773f0e717da6a2e0448
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 17448 bytes
SHA-256: f58bcd30a0fddc63377428047e850a004e80269acfb215d277161d0ef2c74311

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