Malicious PDF — malware analysis report

Static analysis result for SHA-256 1021e494419722da…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 11:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61c784b7bae127a594b8f1b839ffde0b SHA-1: 549d758f5c846f5a5b2fea42372bc924eba5bd8a SHA-256: 1021e494419722da35136709bde53cadf7659eb1f59e6adb2987d0490d920716
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://infrive.ru/uplcv?utm_term=localizar+mi+android+con+gmail PDF link annotation
    • http://gazosilikatnn.ru/uploads/files/31253364957.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613176b0e5798---61331570745.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/44437184746.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/jexojokoga.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/pupesivuwiserazedogozop.pdfIn PDF document text
    • http://intertravel.hu/_user/file/18349067471.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/89448927989.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/negozib.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/4784328740.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/45665796921.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d195f3d5---rakifawiwefuzame.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453931e623f---kagoseworoxenavejeromi.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-12-19-47-31-15.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/16339054488.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/tiwejisirezuvib.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/xodemarerilemewoditamu.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/27346360129.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/jetelu.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/zepilisarivemivas.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/tuxotu.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/65371336687.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/498a31893edeaa76fa5ada9252e9db6a/20535159301.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fofijutinerezoxir.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/66735092662.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 10332 bytes
SHA-256: 7add480b755e44662ee8b11cd0e7346ea2e67eeb088cc215480335c1f715a5ac
font_01_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 18280 bytes
SHA-256: 264ab02cca945c4f3c2010ce7cbfaa3a86ad7e68b5f4d13a3576af7f3393a442
font_02_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1