Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0b5bc724c064b0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 04:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dcfa419b0b69e197da9aff404350718 SHA-1: b9a68f2b0ca9524171ea149fb7c27b04f8eb555c SHA-256: df0b5bc724c064b06736f87ccdf26fe397ad42e9da3051ac4417a85ef293c828
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://donauwell.at/userfiles/file/2606273432.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d70100aa7---71875283091.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6a42dd16c686c2acf50f5aef7256681e/1253540672.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/zoxoda.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/85701175012.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/juzipavelava.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kagozopuputelituva.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16123e0b508002---bukoju.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/8550777497.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vnbprmudlq6rcsbj1dn263hv4o/95192546487.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ftpv7rcripv3aff74lh4bfjub6/13011377786.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/33873699533.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/zasatefa.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/71350776546.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ace8086fe69ca48e98885356f18cd56e/lunureriwiwafobetagaxu.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/17890038179.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/32190127433.pdfIn PDF document text
    • http://piecco.eu/upload/files/22266728158.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/7566501684.pdfIn PDF document text
    • https://campermagazine.tv/public/file/mifipataparoxosobusul.pdfIn PDF document text
    • http://fxmeat.com/upload/file/cd3ef53d04fcf86c87baf1b47cc7e171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=approaches+to+public+policy+analysis+pdfPDF 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_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 11052 bytes
SHA-256: b942d3238a9ed44eb8f78138085318eb47a585dfb125ba91647fc7a55f899c9e
font_02_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 17360 bytes
SHA-256: a90e265a8167e6e9a2278d580283b71f3aabc3946494f0f2211ec4f51e5f982e