Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2780156ef418b7f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 09:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 408ec194759ecba1c69c52a84216f9dd SHA-1: ae16e43443fbf0cdc9acb8fc5bf85adb3ad4a502 SHA-256: a2780156ef418b7fd551a48711422fb443b75624d93e21f17df5c50f2382d6bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=android+captive+portal+detection PDF link annotation
    • http://abwfinlay.com/uploads/files/laxomuzoranotoberilomozov.pdfIn PDF document text
    • http://cga82.com/admin/File/nakonamipegora.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc998590d4---tozag.pdfIn PDF document text
    • http://splogservice.ru/content/files/58063742442.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1ajk8u5vto6l3em132ttjije2m/xizoratemi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kirudesipojutoju.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/19794827114.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/xomanop.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/31435758332.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/zawimerora.pdfIn PDF document text
    • http://weldingplaza.com/files/file/27481021666.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/kanenupozururemade.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/tanuninowiwetawomijewiji.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nbqfubuu1eahm033j76ek91bdi/fadomazopewiko.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sulilifudoxifosijuw.pdfIn PDF document text
    • http://vodnik48.ru/content/file/kadupiradadizinafur.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/58152066431.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/37191736104.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143108d72e64---mixofuzefexo.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/18359988495.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/98759413704.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914033239.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/fewunira.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/dizokexelodu.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/vixewupugibakajuk.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/pekasigudoferetutorofo.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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 17624 bytes
SHA-256: 23ce6f2cecbd25cc6b697b3649d4cf718ceaa3bea111b5cb2c2688f1af3c03f2
font_02_sfnt_off000130cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 10384 bytes
SHA-256: 7d34f7f9375aa44eebaeb817cf39707eda862d9f4154da41c1ea22cc4b6fb0b0

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