Malicious PDF — malware analysis report

Static analysis result for SHA-256 166617c003b2dccf…

MALICIOUS

PDF

67.0 KB Created: 2021-08-16 02:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de36c1eb42a9ef16a994e322d3274199 SHA-1: b1f22d088f8ab2c8a493708eaa45eea31e569564 SHA-256: 166617c003b2dccfae83430e3d8b5f2d40c129614abf5c264922ac572c358371
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The presence of external URIs and the nature of the detected heuristics point towards the document being used to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8303

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.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/56jpalap7mgn09vpt3c866fg8n/bazunip.pdf In PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/denodiroki.pdfIn PDF document text
    • http://biosite.ru/images/news/file/didufuritobanepopavow.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/94749827173.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xibojoliwigabo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608677ab46ffd---1594827596.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33548ad70d---fiwebuzo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5c4cbc86d536464fd6a8025d08d46d25/lisumikimo.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/wodukerefodasode.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c564684331f---vegitizezemi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/pifume.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/323857960.pdfIn PDF document text
    • http://narimasu-chintai.net/jcfiles/file/fateratisodoxemutegesem.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/78755057719.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/subitokovedif.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894a46c3308---3759993121.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097d3d3e8f6e---33907970186.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/98092586846.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ea9102ab167b72371c44d38d3b31523/mojudeboladuxi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mo2sten5uci2a3iq8ah64k2af5/47978321657.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/nutumaz.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/14112418849.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6385ar7lolcuv3koqopm9gbm8s/89969433216.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/720246f82bce2bcbdca14126d3d3fc1c/87590623882.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7761089b27---48596348679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=american+harvest+snackmaster+dehydrator+user+manualPDF 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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 10988 bytes
SHA-256: f4d61b46a205c6e18abc42517b19628a7b764cf2c7d814f68f56763defab29d4