Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c44605619cffcf2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 03:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13da68c1a3b1f4a90745130abf2ef91a SHA-1: 9c8009a436aa4ac0e870f6090837ba2f39e0cc29 SHA-256: 5c44605619cffcf23d7f940b0fd643a7687b3214a501be9270fce51f41c1ed2c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=record+while+playing+music+android PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2c8eb8f2---kuravat.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/55499163766.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/85097880761.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/42260709412.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/19051b5e4829898d3499291dfd302277/zevezifaz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b88da9785---xolujak.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/50998039898.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tetagemajavovamasumibu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/tomovixobatakavokisavusof.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead91f3d4d---watijizini.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/87423276683.pdfIn PDF document text
    • http://ubest.ru/images/file/24819578847.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/jetexanifevefutivofadiwo.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/16951826813.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/67236462381.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/defevuxutolevavenupus.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/23009050299.pdfIn PDF document text
    • http://chayka-svg.ru/files/27290910856.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b7a7184e466ce27e4c12c50b8c9966a4/jotupimuzojobo.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/74623117138.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/98779498728.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_CA7E7483878BB1A5.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 17184 bytes
SHA-256: fb55fe13943e638a7f013959ee9fa83355b290b78a299ea6a025dd7e3427bc1c
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 11208 bytes
SHA-256: db53628e14236aff1b8521ef8dc897c6b13c534b383a76178c46b4fd628f3511

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