Malicious PDF — malware analysis report

Static analysis result for SHA-256 a637e4577397df62…

MALICIOUS

PDF

141.5 KB Created: 2021-08-25 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da747fa8d94454db125df0885d38236e SHA-1: 5ef852fd8548f9dcd172a751d31911243e5f97a4 SHA-256: a637e4577397df62b7eebdc1e80296d4cdd7445c1411e576fa7bd93a686bca38
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the ultimate destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9643

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://grupahatak.pl/admin/_fck_files/file/busakiwinenamodu.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c83c8efc87---kubifedaduxeba.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/52971274316.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a1144e3237a2fd55cc02e234645159e1/fijikesebun.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/pilexogotuzab.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kajezumumutonag.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9b126d7cc---tomitanutajoso.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/28666702468.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/lofuvikakunenidikunejat.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/28163677004.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/24412211104.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/47232611470.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c512c1a8489f23d839a0b0f33595c650/91416146691.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782ea11846f---86350822788.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/l1r4fl41gd2dbksr7029vjc9k9/motudokaredozabu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6653df3469---9952883581.pdfIn PDF document text
    • http://clingac.com/d/files/nufekexe.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/vujewenasekabawex.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/83bf672a9f3e76a19c5fbd43d4d8def8/nafepanalafofuwitel.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/6792760039.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f03de220a---mobinetu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3325scjlq4omab85gvv5ghj1s7/rosesuz.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/2612131392.pdfIn PDF document text
    • https://banghenails.com/upload/file/61189031755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=which+palm+to+readPDF 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_off00020aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AEC 19940 bytes
SHA-256: 028c46bb8f147c8551d9e27167a57b3428a6386f148ace40d82c5e56a7bfac8e