Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2528d2696efc2ec…

MALICIOUS

PDF

56.7 KB Created: 2021-10-04 00:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a8a181ddb937f4cd9af8fc4b0ab0a48c SHA-1: 9de4157e504863959b8428b52e846a05d7c1c567 SHA-256: f2528d2696efc2eca10013f3569be502650cbb3b7838604d28dfee39c0676230
154 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and link distribution align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7013

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=what+are+characteristics+of+aries PDF link annotation
    • http://akademibt.com/resimler/files/36381678869.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wekowulosa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d3d3b1119d6aee3896ae8b3cb8174661/zezakazomafifipigavani.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/neputinad.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210929055032219767.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/xobixenalijatufag.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/legepufebusa.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f97ec2368---kasamaxuvajepe.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fatipetokoxupire.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c8341242---27801142566.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/11159912959.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/94689362843.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421819d66e6---kanurafuvorud.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/97035094803.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xeledabotujobexikurokoja.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/34031338288.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/faniketakinegokib.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gudosokiguw.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • https://implant-drill.com/userfiles/file/tixijunufupobobebumozusoz.pdfIn PDF document text
    • 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_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 10276 bytes
SHA-256: bc12fd4e66d1089b6c2cf4b398eb1eea493fe927008c5366c76d5e6f74cba741
font_01_sfnt_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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