Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce7b7931d2770c8…

MALICIOUS

PDF

97.1 KB Created: 2021-06-18 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4ee52e46460a7d01baaf6e6ecfff162d SHA-1: 9726a4b21c3385b0b6793502c81753c38888fb75 SHA-256: 7ce7b7931d2770c860840ebeb9c650e95f6b2df1fd267f3b7c9fedfab9d29f8c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier strongly indicated maliciousness, and heuristics identified the PDF as a link farm pointing to compromised WordPress sites. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting malicious content on potentially compromised infrastructure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/meq7ur83memv3ip6l923dpm65s/95359514856.pdf In PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/96546656568.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160815f898e47e---63388675484.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5hpp3qanm16jcou63a7j6tdglr/mazas.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/fd3ccf542e676c37cc1675fa86adb1a4/74672821826.pdfIn PDF document text
    • http://webbuilders.com/files/file/xusarokibuz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04cfe8387---3707994560.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dca245442---38972094040.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4885e64f169958ad1e8b0543a9efe09d/80125198971.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9f7e46f4---78184755106.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e52plrdvjt2ja6p27tenhr8cfm/divaso.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c62bec2510e---fametejexanuv.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/798016ddc96f2773a838f5ee73597523/wusonu.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/tekivakiwegutagafeke.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae4324cd3e82685e3a75b636e05a2953/72860155612.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/38908972079.pdfIn PDF document text
    • https://cristalensi.com/public/File/92208651865.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b863b69acb3---ritijupivaxape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=passive+voice+causative+exercisesPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 8660 bytes
SHA-256: 589e4fa760e1082fbc3d6e41fd633881dde59dac0be2bc5c4bc4443a1204a714
font_01_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 4892 bytes
SHA-256: 758b310f0b20d54ed8030ddd8aa03d12e148e746d3f7705eaa6a0f1ae6162797
font_02_sfnt_off00013856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13856 12108 bytes
SHA-256: b8638c3e202dbaacd1b6a5836d52184f812b8055e4c176052aaace93374eb02a
font_03_sfnt_off000161ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BA 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

Open this report in the interactive analyzer, or submit your own file for analysis.