Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e69dc483827209…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 01:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa490edf6ff4ba077fe98b9dc756f448 SHA-1: 4b28889e1c5a7a95db0341edb80aebdbdd536155 SHA-256: 24e69dc4838272099c632e1068de5128faa3df0111f3d97c486648f242ff61dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://utcsp2.rustyramone.com/uploads/files/rotopo.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042442b93b---64706971613.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/gedifosukukexovovam.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/88921471046.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/23039318490.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/3605884849.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebefb313e2---kowiva.pdfIn PDF document text
    • https://dellrein.ru/content/file/mixidimasinuberexoj.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/dinebe.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/21900623126.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/40283522847.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210918_A83DF166212A0A9C.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/lelefulev.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/c12a69be17cf8b9a1ade4d9425341724.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/51414852241.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/nibusumonavunorax.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/p8kd4mrsc3ngfqrfgk7dvam5rt/98503626293.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/62431265456.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/kijibedibosezojataxi.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/97188041012.pdfIn PDF document text
    • https://cardolf.ro/files/38646055936.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/38986548748.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/bovalesigilux.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/71614509359.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/popifupekugirifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+open+mobile+lock+without+losing+dataPDF 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_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 17624 bytes
SHA-256: 7dbeaaf4cfa5f798d0fb75b940e44d876d45360007452057f50bb090fdb22955
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 11268 bytes
SHA-256: b53d2e56198e4b376ed7b02d77956d56930e028308ae5ba35d827888adbf5d4e