Malicious PDF — malware analysis report

Static analysis result for SHA-256 836bdbe74fa0aadc…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 01:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15832128beaa6a5bbdea872492cd3ac9 SHA-1: 3dcefd75e5edbbb0e2542472fadca2adede25996 SHA-256: 836bdbe74fa0aadc0c30003f8f53d45db6971fa00173860cfb7f5a74bc589dc4
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or 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 distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=bubble+messages+for+android PDF link annotation
    • http://coimbrasoftware.hu/images/uploads/files/lekagamomamofenubu.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nusesuwaxinok.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/tebawelowuv.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/50502814006.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346e9f3a104---degolevoxexuder.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/75102583079.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dedalusodibujada.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/88579513787.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/bisigupesuvalebefamidi.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/15735030901.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/18880327965.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_8B5409A74ECFFAB9.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/54489056031.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xujapoginuwevegizo.pdfIn PDF document text
    • https://redac.ch/upload/nejaparosoleboxo.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/842872484.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076794d25d---rudipojopipebujudojibum.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/66687726414.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/53979712673.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/50244399228.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/lepasajebikokeb.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb8d30c36---5841347614.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bumizududumoxenofelal.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/64744311019.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/72558181694.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7aa7a99d8d8e897304da99392fcffc4a/55345340597.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_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 10892 bytes
SHA-256: 00cb2377172dc7e52b031167b258cafc05c427a8c554da955e90b82f54d96d3c
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 18452 bytes
SHA-256: a9e14d5e1e589c5ef797f5a1b73f43b308179967120f86882e958ee2ab89b84b
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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