Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cee10969737209…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 18:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 826ac82d89ede0840a2cba3b4a40c38a SHA-1: ec3a5d802da2f3beef9c4813df75b65d7692eb73 SHA-256: 98cee10969737209d8ffc6f8cbd4c24c04a01f380aad688950adf0d9ca676ee4
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a 'Browser extension / update installation lure' heuristic, indicating a social engineering attempt to trick the user into installing unwanted software. The document body is heavily obfuscated, but the presence of numerous URLs, some pointing to compromised CMS uploads and link farms, suggests an attempt to distribute or mask malicious content. No scripts were extracted, but the overall pattern points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://sport-jicin.cz/dokumenty/dojowegu.pdf In PDF document text
    • http://instant-image.net/UserFiles/Site/File/gipome.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/rodazito.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/daxepetopukedikosuko.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8cc1d8b25071d288e0d6ab97031ee33/fawem.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/dadizizununa.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/dubupevon.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f7089a1a---16736570021.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p3et6nhhs1i3i44u0g901lntru/wiwidajem.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/nanuze.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/jukamimezulutiwesasajoz.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16315174589430.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/86123261ab2979189f2874a42c281eb7/jojomu.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/11932769139.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/29640100444.pdfIn PDF document text
    • http://medi-sen.com/files/files/35083691861.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/nebudobinusojuvubiwixep.pdfIn PDF document text
    • http://actinq.nl/upload/file/73403300645.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b46a7d5627316fc9a577063d1385dbc4/60944582295.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/15493976304.pdfIn PDF document text
    • http://ttc-investco.com/img/files/21608406370.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/depewedemod.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cd041404a7883e1c1737efe125f6f7eb/13335996150.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ouhg352t4uahe2b82bqib7ono6/juzeribigabek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+mirror+phone+screen+on+computerPDF link annotation
    • 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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10608 bytes
SHA-256: 84fa2bad146c8f101966c3cc90db49b2e8a18bc304c582370f193fa21b5a5c31
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 17752 bytes
SHA-256: e9f1412c7fc2752cac6c433ca49d23e9d1408fa2380d983a10005f5a321d635c

Open this report in the interactive analyzer, or submit your own file for analysis.