Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a1ea0d4494c7bc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 20:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 856aac4a51f0b5f382cc5d932a359f3a SHA-1: df3597e42ef9ddb5fda49f0a27a0123b229e4eb0 SHA-256: f4a1ea0d4494c7bca4c7fc0c0d1585cca1bcd8edbf6dead87d38d6694460af43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=android+root+emulator+apk PDF link annotation
    • https://binarbaidequipment.com/public_html/userfiles/file/feteputuwakoj.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/nenobinasapug.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dutosabojobasibajakof.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6f183d58---62633449954.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/tevirasavelugixikur.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/86111762789.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/tikixirumodovoru.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/7185477113.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/25433613837.pdfIn PDF document text
    • http://szcftz.com/upload/81469248820.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/44647884191.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad865e4d4---70493337054.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/242d9e0ad21bd312b6836bb8fe4f8fef/ranitavugobetisu.pdfIn PDF document text
    • https://melz-feu.ru/upload/kadodofopigivivi.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/14226328868.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///26992259601.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/66873494083.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/limelivakufugipuxo.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/kedifazasojomi.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/39730571303.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bonog.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/76862871747.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/70181652710.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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 19616 bytes
SHA-256: 546c25cd5812cad7cbb33ed20e3da350bfcee0bc743ca71db7214c425d1a766a
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 10560 bytes
SHA-256: 0fc13cbae71fc8e7d3d25d3ec354de684d523866c90057ba36adea2feda06d59

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