Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51858133fd32a4d…

MALICIOUS

PDF

70.8 KB Created: 2021-07-13 05:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cbfde364149a99168f64da72d0c1486 SHA-1: 804782b0f04abaaebafca31b8460c41cfdc31201 SHA-256: d51858133fd32a4d3d1a8c7b8ea339bd55404794b9255d911682d2421275a255
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious actions within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute or host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jvpkloasi8ecjssnqgvhlr4s21/pirate.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8e8aad0f7888a9a1db4ab4128d7948fc/46410467159.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/13858075527.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/79279264815.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/doxusiriwilepuvifag.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/ditiza.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/77094441944.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b564b2274f4---19047114646.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/fulesanad.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ebgc1n99nlmknagdgof5qgqvql/87570253477.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tufaxikuronebifab.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160805f6af23ff---22071502277.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/34681305973.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/fovevez.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cadb3baac7bc89d29c982439205cf7ed/58471249718.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nenufomazodave.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9dkgb0qinlj78vppbfir9d9tl2/55869985725.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5e85e47fc9d1f91378d10efc429b0252/xerofotebe.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d50bf1bcf---95213457266.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/dinifalumasaguzonuzezus.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/nilowolavufixisexadigotuw.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f8427950---wokumukeguvukepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convert+docx+to+pdf+filePDF 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_off0000b57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 10484 bytes
SHA-256: 49717b609cdbaf29c47d9b33264a0325824e458400e2aae4b5317cd29a8d97bb
font_01_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 15764 bytes
SHA-256: 52ead9e68c7fd411f7701aafb7f608e2d86cfd27872f3ab78291c9644bf4ff4f