Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c05a907d91c181…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 07:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a4c80ee5ae39acbc692032aea74317d SHA-1: fb83557ace9d5969903a6ba3853ab0d48ac10c96 SHA-256: 39c05a907d91c18137b6f28db098df588d568d0269afeeaab9102dab9a3b6b2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It exhibits characteristics of a link farm, with numerous URLs pointing to external sites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=multynet+led+24+inch+price+in+pakistan PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1eb529d89beb0ae56b8227c18519b941/nowimaxeketazazo.pdfIn PDF document text
    • http://cycling-software.com/files/file/mizazujazu.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/81486440565.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kevuz.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614472269fd9c---93271802353.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/regefewivolevirinojajir.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beebeeb79a---podigeroka.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/xexova.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/81714758663.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/murunapivuz.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/70719790561.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bofaviwakuda.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/rodunugug.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/sexuxefukukos.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/26735017135.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/luwufunifikaza.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/41692751775.pdfIn PDF document text
    • https://clove7.com/userfiles/file/jifibudawolep.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/88877524570.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/27262750483.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138dacaf34df---vidilepazolifawiteletog.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/36563012029.pdfIn PDF document text
    • http://hongdacable.com/d/files/jujijulufatigarajilumud.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7a05a276---57686930263.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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 18292 bytes
SHA-256: 24581f9f98b910d801198d5eb5cadf6ea7b22917092989a24669673490c1f9bb
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 10988 bytes
SHA-256: 7f44a2f491cd76073cd9fefea2210224eecc9ebb96e1fd326ffeeb8ce28b580a
font_02_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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