Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a892bec5f592d17…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 13:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55b15115be656cddd318e73313725050 SHA-1: 8182535b419145b07c2c7c0dcc9805775a6d7173 SHA-256: 8a892bec5f592d178aca51e2776deda9f77277c654bd8ef139affc446afdf5c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=talwar+wala+game+download PDF link annotation
    • https://growyourmoney.in/userfiles/files/narujesanoxaraz.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/50533169916.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/gosirasudazunowekanogaba.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9eec18684---77974831039.pdfIn PDF document text
    • http://hangquangauto.com/files/pimativefosavov.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/xerugij.pdfIn PDF document text
    • http://zkpower.net/upload/files/lovuzanoxumunajixujizal.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/81745398051.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ccf2e581abd633f7c1394357a83c11e1/lovasapon.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nopulatexeso.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134615f726ef---febeburulelov.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d328f7b8cc---sobiwedirerur.pdfIn PDF document text
    • https://ms01bet.net/contents/files/xasimu.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/selipoduni.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/34335782903.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hd3su0f9nend975e9o8qrutebp/memalumakomapiveweveloni.pdfIn PDF document text
    • http://keacg.com/upload/files/mixuve.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/11745153849.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613248171df67---96132516379.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/j0e5v6uvkqvu91av1qj8skpldc/37246332132.pdfIn PDF document text
    • https://bagstyle.uz/images/file/35190072738.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631003510.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/fawajidinixazizo.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/tasimobukaraxis.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/rupulefizonotogu.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_off0000c130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC130 17456 bytes
SHA-256: 81bce5a8adb406d8098d5d5c64af4eca0277936e9d1e8b1ddbeed5c348695d76
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 10280 bytes
SHA-256: f9909f100e3bd6cdf3fc27a30deac8d7a383ec42d427da4fe57f0ee613665d37
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1