Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12e84c34f155da2…

MALICIOUS

PDF

87.8 KB Created: 2021-07-24 09:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7a1de71e9b0b3137db76fc4f5e9edf0 SHA-1: 53de313652207bd1cbe5486d12473052bf51cc1f SHA-256: a12e84c34f155da24d3bd911207a7300fe987b7d5cbb89db4cbf421cd819cd13
164 Risk Score

Malware Insights

MITRE ATT&CK
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 compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b891180a9---tuluzag.pdf In PDF document text
    • http://madmojo.com/fckupload/file/fowumibab.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/vadoxobi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a92ed6ca461b07f7ceb525aa345fdbf7/kisati.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0b7de9c3b2f76b4c4f8ccfba8d728675/40832498171.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106102351397386637ywga1.pdfIn PDF document text
    • https://davaocarrental.com/images/file/41105223270.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/27709952001.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/botepibinurojavulifajaxot.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/wovutogudoxu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14e9cbc58---tekabasumavafiwubilakovu.pdfIn PDF document text
    • http://changdahk.com/upload/87475689282.pdfIn PDF document text
    • http://klhl.com/userfiles/file/22059726106.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/13400651443.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/pagegikogo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/33963689337.pdfIn PDF document text
    • https://bloomeng.com/uploads/1155443874.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lilesatitovofakudezaji.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/85438747641.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42bdd1433---72584773005.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7bb3e1465329372952a52ec210bb2e96/73415970045.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/73734197559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=salary+range+in+saudi+aramcoPDF 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_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 10904 bytes
SHA-256: 5a7c797da3aff625bd8b634a063cf16c223d156f09dfa13dbd7245acb6d14359
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 17096 bytes
SHA-256: e65e2594e0faa7d8f9f56fca0232d14aa2c87f7a05a8273865a527d2a07c4854

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