Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aedd4d7f43f9c3d…

MALICIOUS

PDF

70.3 KB Created: 2021-08-31 21:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0857b12a5991877adf2abc27ca29185a SHA-1: de19ab3cca1c2f9cec93f4f94285c38954b07ad3 SHA-256: 3aedd4d7f43f9c3d3b3e4282065609f2c57c17a3e6f24dfa1c3831e41986c229
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URIs, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to potentially malicious content or phishing pages. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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=origami+horse+step+by+step PDF link annotation
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/nuzejexataxowepogepizon.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/veluladapaxiruti.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nshtphf8rvgkaojmnd8ir70rok/jarufulugoraze.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a7a537a11---74471795841.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e97fb9e7b96e64156dc92322fc1cef2/75610939250.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/okg5gkj9th5dcor6agtr6tfmo5/gilugama.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8e1069a78b4cacfb0152eb04e36d1ba/wudimudigewepowaj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6sc0mobun2upg6n78952vpiaa4/bujerenijaxukitivep.pdfIn PDF document text
    • https://isleo.com/i_photos/file/nabijem.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e8248a9c---6274318382.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/s21nh95q5jqgmhdrul8paqofoe/6216659763.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6ecb5950---bejuxagumu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9vl6jh2ffgr5pmktceuol8jj85/34612896587.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210719130709.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/66505641877.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/fuxesiwubu.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/389rsoiu7fj4gsm4gnf8i36moe/61771635250.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cuumd59n9mm9jvociu6d9ttss1/gemurufokeporifusaxesepi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902efb83547---sixowodotem.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/40bfa307ef928c4844fac72e30a0bc08/79708974428.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20338a74f0---saboma.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/72706020278.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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 10828 bytes
SHA-256: 4f7dbb96b15388e170d784f617821ea9aab13333e959b94fa370f1546c784b27
font_02_sfnt_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 15192 bytes
SHA-256: e491ead0cece8566fea0f83507cb74777fbdb16c81ab0bf3bddcf41bd1a47e99

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