Malicious PDF — malware analysis report

Static analysis result for SHA-256 0378aad5ab48a314…

MALICIOUS

PDF

73.7 KB Created: 2021-08-01 16:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c01240435d5efeb7dba9bdae5d738b97 SHA-1: 2f33595db56ec73aace49cf78cd49c4c88a849a0 SHA-256: 0378aad5ab48a314276950c6ab0469f6acb1cbb6eba216a039296f0905d0df6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and other external domains, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=basic+english+grammar+book+2+answer+key+pdf PDF link annotation
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7362541337ead42b60f8e72a518a9cc5/64264068466.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/4aeaa3c2b4b6f7b35d7e8ad801ac8be9.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bccf9861614f8ecb5617acc69fe0cb56/48976346293.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5shbkod8mei3nmf5pib1v51uc3/gogef.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39ace0caa439cb01fda0e8c2f4e1f107/16107817997.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/21182408934.pdfIn PDF document text
    • http://stroi-sistema.ru/img/96979422862.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/9869075262.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/58030496507.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8f365520f---34864231071.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/547163705.pdfIn PDF document text
    • https://rcot.org/userfiles/file/69930766663.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/43569754693.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mezujixopunomelatewimabow.pdfIn PDF document text
    • http://gdgom.com/upload/file/210609030424276803zpap7un9njpd.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/vukubuluxako.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087809ee006f---rodozof.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/pawilonixazawurisume.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/35070736609.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609050f392be1---37243273209.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0101c404ec---xelofenuredodamizuj.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/busexebavaxe.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd4475f50---8863791223.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/65164709696.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd80c18c0b---zigufonerilenumiva.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_off0000bac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC6 11572 bytes
SHA-256: ef0e2d669c6c234c11970f96407046c4f049686b17603790ca8a128f89f4bff5
font_01_sfnt_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 16688 bytes
SHA-256: cd28943678bcf319a0aa525d66e0e587dbf8eae5f14e4a32a2eb0b55740b7611
font_02_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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