Malicious PDF — malware analysis report

Static analysis result for SHA-256 8023cd24beb4ff49…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 16:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ecbba2678b853a945a98b7e6ac874ff SHA-1: d8442a5b66c1bd6aaa9389764bf1a7f6fdf66cd8 SHA-256: 8023cd24beb4ff49aac7f5b9566ecd27efded6b32993eb8aea4cb63917a5a119
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which is a common technique for delivering second-stage payloads or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=sample+programs+in+keil+for+8051+pdf PDF link annotation
    • http://digivideos.net/ckfinder/userfiles/files/reguvomatafufonunufuvekad.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcef3465ee---88157791958.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/86094264119.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3is9pan7mrlpbm19g9vv1mte4o/68548474578.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/kosazanukotu.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/87982684624.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/velukesowejusosugos.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/4038128591.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xifesepedewozufi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f86c8ca73---63936013060.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/88569811992.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c42faa2cd41d42753e16706b1cff1a2f/93836634859.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jujipotipileninupogipixa.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/38565223227.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/78266318569.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/sebovivijanuxakunopamaru.pdfIn PDF document text
    • http://letdentalab.com/img/files/49480725113.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea28825a75---fuzimezaretovelojaze.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/59364463808.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/3849407732.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fc2fb09ad66ca81107ba64238256cf35/6124516030.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9f565b8bfd73fa9c3af0b10b09cf1765/zixiwawelavuv.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9a01f27956609980b8462a541a1d3948/lorem.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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 18364 bytes
SHA-256: aef5c3c05a47723915192517247a1ef4b50c6561ac318aec18e357acd8ee56d5
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 11424 bytes
SHA-256: 9f419494a31f48d390c8e93034af86045a14c7293b87788d5b05b243c02f1acd

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