Malicious PDF — malware analysis report

Static analysis result for SHA-256 538045ea134e2c73…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 10:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84088d8e2eef6f1bee42f57e522893ce SHA-1: beac4116cfa4a9a15ec4fe4c30e6d79b0be59607 SHA-256: 538045ea134e2c73caca60d70d23089341427d51de57d5274a6e5435bf9af562
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

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://chcial.ru/uplcv?utm_term=2019+gmc+acadia+denali+owners+manual PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e264139beac.pdfIn PDF document text
    • http://cosyromania.com/media/file/guxetu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b1eb5015a2e4b10f869fe9b997f65ba7/fadunoxi.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/voxuwuxekewusosu.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8c76fd272cd8e91139158ca0c4e7c4f2.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2ad6f18f---demivi.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/tikobotidurosajinuluk.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/78848539039.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/um9rcc0p0dqnjpm7l06n053432/96949713700.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868d6563495---barerixefaf.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/21555030750.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/vixiwuzurat.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/65232145316.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f333d3555---96498146598.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/71004865962.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/76a3f5c7b0c0088bbb9f5e9c6f34fad7/45069826619.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/11946519658.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rhabq24oeidm2d6ttrl8npeet5/tuvafe.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4572536b91c20db317aaa89a8e54e818/30218524558.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/2075130093.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/sipalilewuxexevajerije.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/miroximefifiwala.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/divixitifemigudixixi.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b6a0e72f371364ce1de358044e41dd35/tixogezusorazedidi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zudadifejoxama.pdfIn PDF document text
    • 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 17944 bytes
SHA-256: ff215f0d07f2dd9de51d8bcfc2156d85d3ab20f35e2abf1355ae749a1486f4e3