Malicious PDF — malware analysis report

Static analysis result for SHA-256 454bdd74a3d39908…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 05:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6c290f0b5bc96c6ad8897d5733b03b3 SHA-1: e7883d24d0221170864c8b0970758c5365c6b777 SHA-256: 454bdd74a3d39908b599b5186738c47db74a5b7e491b18facb181c02020b02c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing activities. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=download+cricket+19+game+for+android PDF link annotation
    • https://eghamatyab.com/basefile/bainbookcom/files/kopuduxabe.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/70274279463.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/92430046061.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/gevewavukunarexexos.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xotanaponufoliwerarulolu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e57bf77---7313705869.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/55ef467c66dcfa03d3b4b64f11c6e880/51763505562.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/17590980204.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/98652588945.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/govibijiporo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/73923399034.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/99712910080.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/jojatepebavuwevosa.pdfIn PDF document text
    • http://santabruna.cl/upload/file/jafin.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/eb6eb41926869dd12db25c11cf90d9bf/nogifebikav.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/54284177214.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/051soddubm97gh4fejlceku5m7/wamidapizirizogupanu.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/46941931599.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/652e462ab45d9b39186b9de00a696ed7/29848372348.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///wenopeb.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/fufos.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/2567848736.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/54385348644.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/92901635024.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zikutibuwojajutirugojo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321add54b47---19686909016.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/17862613124.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_off0000bb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB01 11052 bytes
SHA-256: ede8d0deca95329305737302ab3d76c6677b740c9fd1cac4dcd50f429a68177e
font_01_sfnt_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 15332 bytes
SHA-256: 6f9a26382ecd001469bdc529abb5653fc9d29560f1deaf0c7ce597ff316d4d51
font_02_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1