Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf36a82e9f6eff3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 16:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70739344612cfeab4d069555511893f2 SHA-1: fe688bea72152a5cf4df370c63a5f9285400e8fb SHA-256: dcf36a82e9f6eff3219a5c01a5c62485a083e99e91fb91e49e8fa681fc09274e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of URLs, many of which point to compromised WordPress sites. These URLs form a link farm, a common technique used to distribute malware or direct users to phishing sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/q95i38sufdhls1a5mm8f3kstv0/17847735920.pdf In PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/81076722425.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/63241262374.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/tilanozovuguzideroke.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/dojapisugebelujabeperubax.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9f6b02f2---3327023348.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac107094eb0---libipapanepilupadup.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/22330399334.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/63570276367.pdfIn PDF document text
    • http://hak-al.com/resimler/files/zorupilesorananumew.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129617e7d9d9---biviku.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c1fc982c4---kukokebodij.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/rusalodo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc1c93f52---60878263929.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/sapixovi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aba496776da---nujoxipuwekatajipob.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/98953956789.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/14e417f6f24ff96c4327cff3e7ae7d66/wovufomoferexu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/sizoredetodejadowisiti.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/tuwobus.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mv3h0nqer1s7d5cufl0lppgdd5/65723380503.pdfIn PDF document text
    • https://led7.ru/file/ditudavipu.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/44816465060.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16d85e85ffa7477d555049b3d9b3fb7f/10287516153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=manual+software+testing+jobs+in+torontoPDF link annotation
    • 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 19204 bytes
SHA-256: 6fb7bb7cfab58195eb84c578e060d328c5dd9184299320fdaa6c5b84f55121d6
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 10840 bytes
SHA-256: 2e5b6358714e809115e3e5206cff569250d51fa8c94e3a94377aadacddf090d2

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