Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d10659c88634fc…

MALICIOUS

PDF

90.4 KB Created: 2021-08-07 15:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20f18cf15f4ef70fd0ed0fb0a3eb484e SHA-1: 55f973ee041c0cbe3ebab6a426fafbe2ef578ff7 SHA-256: 29d10659c88634fc526744d0873cbb500c3efcbc862e1062ed117ad5e6689d23
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to external sites, potentially for phishing or SEO manipulation, rather than executing embedded code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=fallout+4+best+weapon+builds
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075891985c77---88307764615.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/befurosizizexisafituvine.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d846fdf7e2---faxolisujazibepaludis.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2b943df80c7c9ff7aab68390751c686d/nowozojupeluga.pdf
    • https://abofahed.com/userfiles/file/88798814990.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3e3c2b62e9f4384c927f2a02752d14c2/nawidavelumarisidajovavek.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105270738449514.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee156219b1e---dexelepakudu.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/46925616922.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c0c920f6---bowuwizazobopabuxifimilon.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/zozipeda.pdf
    • http://tz5168.com/uploadfile/image/2021/06/04/file/20210604_095348_198.pdf
    • http://bilmatbasim.com/userfiles/file/85842337176.pdf
    • http://whalesart.com/uploadfile/file///2021061213565723.pdf
    • https://aaaxxion.info/images/file/12281195249.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/30181268251.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/18919819837.pdf
    • http://richwoods1969.com/clients/861079/File/dakinepuzojag.pdf
    • http://markone-tools.com/upload/files/54113061587.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077204ead9e6---93084492349.pdf
    • http://elma1.ru/!upload/files/givubara.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160817149a6f23---muxaj.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/76646742950.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70c72ba9b---fugiribugixez.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e015fc4b---91786742527.pdf
    • 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_off0000fe66.bin
fb4c3439fbba8d49755ffd168f9f6a73777970aa783b984b076e9687975caafb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 10664 bytes
font_01_sfnt_off000116d0.bin
a0278b2eeaa8ad17f2c3de765ece0fd8e88774d9b251bd555234aec40dbbabd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 17180 bytes
font_02_sfnt_off000143b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B3 16792 bytes