Malicious PDF — malware analysis report

Static analysis result for SHA-256 308fa71cc809e7cf…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 19:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5caec2ac4606e0525b82db587fcde79e SHA-1: d26b448dbe945d668bc9a0eec7f3d34bed6399d2 SHA-256: 308fa71cc809e7cf9ff10dd85c1dca89e43bb4808c74888603786251bda9beba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites 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 may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ydis.kr/userfiles/file/020655538410.pdf In PDF document text
    • https://wonkingchina.com/d/files/24496218324.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/powojizi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/39128983275.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/53015254095.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/23519356086.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/47876684695.pdfIn PDF document text
    • https://go2germany.ru/files/file/25190947733.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/11953961805.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/65550413084.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/45735832848.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/45554786255.pdfIn PDF document text
    • http://bluebossa.pl/files/file/wadofejoza.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dccf3915d---geraxuf.pdfIn PDF document text
    • http://dalaichau.com/files/48866451073.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/97prbsoid4ot08o7afq2th3hb1/82961906019.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/kipumale.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/61f0aa54737663b944f39e6dc745d159/jefigogopexurawirefusutow.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/17880660882.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/wizajebudosagogadot.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/popuvatedok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sap2000+api+manualPDF 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_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 10212 bytes
SHA-256: 5966de0938d0a02d3a2344cfd0e60c646b329138fd513d9403ff7a4718a42c73
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17260 bytes
SHA-256: a153427500d1b390451bc681aa4d5276a2957b49bdc5007813af8479d65019ad
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1