Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9baabdda1fc61f7…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 14:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adf09db0fb5573c8fba36a89ef8bea23 SHA-1: 10efaf2073eb3e1fab43dfafd816ea90a19622fc SHA-256: b9baabdda1fc61f7a3da7315e2bc66c4d698f76083385ed12ea5a8f7127ed201
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malicious content distribution intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://kaitosushisb.com/uploads/files/menimokidonefepulalir.pdf
    • http://ozhelalikram.de/resimler/files/totizovit.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//82429871876.pdf
    • http://astro2sphere.com/admin/images/file/29947944366.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61b510878---kemesumofigovapiger.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda01b9ded2---84751656588.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/kebidaf.pdf
    • http://wanyuantemple.tw/userfiles/file/lixisodewugonaz.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8f415bc8---75270814393.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c26e31a0d---bedumu.pdf
    • https://whitesal.com/data/images/file/3869_20210705145549.pdf
    • http://szentistvanpatika.hu/upload/file/46906660610.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9ec178dc329ddce354f34ff7dc903a48/29605891776.pdf
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/22091165810.pdf
    • http://101-games.ru/images/uploads/files/84058785784.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pi2jt08ic8g59o8qji7vp6k756/kinonipuvunarekexuwuja.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/48143c5adf58ccb5515b9947ef98fc75/8790606029.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d83f08380fc45d6e007cd146ba43145a/78168483945.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7su7msspq5h9lasme0fkj67s7e/bupuwox.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/892024970.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1c26b9746be6166ffae00829ee326768/letufutefepor.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/9f4e060593104c4fa7f133e70073d1a9/57280680360.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=homeopathic+best+doctor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16792 bytes
font_01_sfnt_off00010e04.bin
a7ad68331a8b85f76b49156a8e929b0ee3831d1b7dd3af3c32eae8da11f6d75b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 16732 bytes
font_02_sfnt_off000139b7.bin
01ea8de6342943b9bdd5d8d609d09651f3070408b6e32832234640637cf285ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B7 10760 bytes