Malicious PDF — malware analysis report

Static analysis result for SHA-256 19eb833d0e609005…

MALICIOUS

PDF

93.6 KB Created: 2021-09-03 02:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67327434cdc1dda1517caee07425362d SHA-1: 2f72aa5d8c4547da42ee7dd850e5fe6170ad17fd SHA-256: 19eb833d0e609005f21cc51f97a735a4bf69bfeffdaff55dfd103e784e6f68f7
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=light+reflection+and+mirrors+worksheet+answers+physics+classroom PDF link annotation
    • https://marblobathware.com/app/webroot/img/files/21131872735.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16097afc8bf669---3657597797.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/84341145342.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d1a3e448---gamupizo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/somobop.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9f9cdcf9---28551040255.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/barofebedilazunexaxakuw.pdfIn PDF document text
    • http://minhanh.com/files/kebowupijewu.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mupixedurir.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b650ddefd24---50299341384.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/32847381909.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/derujawipiw.pdfIn PDF document text
    • https://lecapsuledigian.it/file/lexux.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/legozupirukemekelepogisiv.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/kagemupasusadegojamumog.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/61400869466.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pafuvifexadufokavewazozam.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/74810113716.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/waniziloxag.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/91652621485.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/70346b45a8585466ffaec1ada33e368e/povesinarifowepadofabomaj.pdfIn PDF document text
    • http://harlit.com/upfiles/file/11902846330In 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_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 19260 bytes
SHA-256: 6e21a3ce864923b60da03a1a9b6bb74a7767f6def285dec46b209f151c44a022
font_01_sfnt_off00013624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 11316 bytes
SHA-256: 90bb1bcec2be1a8d9beb7384dd2e2b85ed2df94c885a4302568b47e259ff3ff2
font_02_sfnt_off0001506d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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