Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ea17f98c50031a…

MALICIOUS

PDF

74.9 KB Created: 2021-10-01 02:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e77c9180def92fb206fa185f97db5e3 SHA-1: 316b3c3c0b06838920bc8145fd480fb259967b94 SHA-256: b7ea17f98c50031a0cace8d50678b8154c2d9fc7058b6fb068257e1520eb99fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=naat+ringtone+ertugrul PDF link annotation
    • http://orthodoxvaidikasanghom.org/userfiles/file/belaxexenexusofulaju.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/10595280923.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/51661320000.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/89087561750.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/98229409763.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/kaximarevepekefozisogako.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16156404614d0c---kajozafuwebewimojarid.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gaberomipekuziwo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f447561f2e---nowuwudivev.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sojujotatowudizulirolak.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/4052455300.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/xezenexideremodejowera.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/bosibamawoverabasuvuvanem.pdfIn PDF document text
    • http://abwva.com/uploads/files/gutunulijebujurekagazi.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/10015496761.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/latirafetijakedun.pdfIn PDF document text
    • http://mfahk.com/upload/files/lezamixukugopet.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/18284017523.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/52919661960.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/tililokugivijukux.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tenuzagafarukag.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/72492893074.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v8ot5j56s64e6lveua0c0otoeu/96598862330.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/dojalozizaki.pdfIn PDF document text
    • http://k1a.ru/images/files/file/43042537979.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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 10192 bytes
SHA-256: 487e9385d12a38edddb341e57ccf1237e7f2a26803139f2341f394195a668524
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 18152 bytes
SHA-256: 0358641bbf61c1186abccd63d673138a2b53c636c236ddcac95d97f453f4f24f

Open this report in the interactive analyzer, or submit your own file for analysis.