Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bfca73d75083fe…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 20:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 418b1f5423ad871a58bfe16940dd8096 SHA-1: 8c1c9dc38b83de863e30d3253ca799da6e6196a4 SHA-256: 16bfca73d75083fed513927f72079a4ad0abae08925c9f41f702ee4790f606db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 compromised WordPress uploads and disposable hosting sites. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=garmin+watch+forerunner+25+manual', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=garmin+watch+forerunner+25+manual PDF link annotation
    • https://glycocalyx.nl/userfiles/image/file/vofefomukege.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/78962951405.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7oa3j91fcigqlepduoipivhp15/17718352578.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2b983bf9---bakakigerazonojunavu.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/kenilufeninazotaxuxexamed.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/17902120021.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/73801529589.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/vudilinisijogome.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4acf5314d.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5a6bdd8ecb868a5023ca02deec3c5ecb/33856289853.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/vesol.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f0c235e21---50111197131.pdfIn PDF document text
    • http://opersan.com/file/80459512831.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/49f030c3481485c2fdd29adb1511169e/60784875234.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/22608141646.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/divibimu.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/33037996135.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/gogokuvej.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/adace8827469cb612d98fc7594db2cd6/mikemelatixulurifalixada.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/rifev.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/lobuluzasavelaputaju.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/korotileb.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/55003367489.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/gekexisilesufu.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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 10912 bytes
SHA-256: 91a7544c00629827c89cb761b16fe4fdd8e9fa61813af866b7bc10a6dc4258a3
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 18564 bytes
SHA-256: 3d2e9a009b4c6c93e7eefce858e434ea45a907caecdd6640f0aff4053e1c5312

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