Malicious PDF — malware analysis report

Static analysis result for SHA-256 44883ddbb01f3f30…

MALICIOUS

PDF

88.0 KB Created: 2021-07-19 21:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca976d90f386d71ad4a0e8094638c530 SHA-1: b2c5f7da2b2e51ad7c877ad2db1e381f300020fe SHA-256: 44883ddbb01f3f3052edbab7e5634f379e422400995ba60c07aaffe621c2a9ef
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier strongly indicates maliciousness, and the overall structure suggests the document is designed to redirect users to potentially harmful external content rather than providing legitimate information. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160803b6f0016f---vasunobejenitalebozin.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/45708477751.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/83834033747.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc62ae9227---56024730077.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35e7b5571---61296604169.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9434a5ff33b3e9cd5fd0e80b14c3df78/98550729780.pdfIn PDF document text
    • http://dzbnf.com/upload/file///58047908886.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/legipibaxur.pdfIn PDF document text
    • http://yuha.be/_files/file/korinateworenase.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8228584181---36527968761.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41ee3aec6---bafopenisopamarogejawose.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/4ca6ae5f654cd4ebecdddf34656832fa/tetuvogakonexejes.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/25170821603.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609855236e479---40822851725.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/soxokakimakewotifepomutuf.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/85306559926.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/65656336784.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70cb8e3f9f---pajiduromatetugefajudi.pdfIn PDF document text
    • http://chinazzjx.com/d/files/beviwusopawotez.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/9d0910360ed436cf2f43381a00f26448/guxizofepazenusozoge.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i54oj2jn0ua61mfshanr856rl0/towuz.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/mewikiwerara.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eb9d7a84c0e3a365a8bc137e90a834c8/51342348120.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/22512200127.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/92161368676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=4+letter+words+containing+zPDF 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_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 17896 bytes
SHA-256: 827b62a5438cb2fa2439b3efdf12212594e30e029e8717a2d1f95925a20282d1
font_02_sfnt_off00013a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A45 10672 bytes
SHA-256: e7678dd70553bdb51f4d9d79734d7a964555b648a82ced571c820a4cca1b19f5