Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90e0e115ba979cf…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 09:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98852ab8e4b2acb0041690bbcfca0a65 SHA-1: 988e1e915bb459cb72404950b4cf2cf8d20a6e83 SHA-256: b90e0e115ba979cf9f86158ee2ebf0d52ac0b0dfdd57b05ed19f9928783ec99c
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, indicating a phishing or trojan payload. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=meals+on+wheels+application+pdf PDF link annotation
    • http://fanti-fitness.pl/uploads/assets/file/47105693748.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cd85f5b65f7db6128b6569a4b3bf916d/vukurolotefasoreta.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/bipexomederelukegizetapa.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/wepuboj.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/37995945620.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/kakedumulinupilikuseruseb.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7204f0e45ac466c0eee4b374d767599f/4383180131.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c109d47e---sagavakewejujurolu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/erlgb3cnatukgku1nm2bb1fd19/konojavugi.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/40029274628.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/13908528964.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/99549541557.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/65160205670.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/ginavemixuvawuwaze.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/66222339621.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9693dcb45d---31569842163.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/wewofibadomepomuw.pdfIn PDF document text
    • http://staropolski.net/Upload/file/wegoxufifujugud.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4f0bf4cc7fcf038fd80f81f34d71c8e/23014352147.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8211296e012ec1a8680ec375bdd30cc3/karijisex.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6197f2d88---jasibodipefiluduwap.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9f42370a319082fd680f7ef6155ab7f0/80551026455.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/galugijidusaxoni.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/8549281840.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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10696 bytes
SHA-256: 09c72e8f48eb25d89652f75c3362e42ca76cd0bb85437c8815708244895b9af3
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 18760 bytes
SHA-256: 24f5ace4cd7a633da10ccf6f30199ad64cbfa15986ea6c20cabfa33a9bb8194e

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