Malicious PDF — malware analysis report

Static analysis result for SHA-256 2112cb30a2b8100a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 18:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5234359811576e170b6e34de555b0630 SHA-1: e700b630bae88dfd9564a9e4cf2f5378bf91edcd SHA-256: 2112cb30a2b8100a919e9023c93bc2a85b5c8df97ae254fbf45d9deb91f5e959
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ct-tci.com/cttax/userfiles/files/jisiwepeferoxafasib.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/56qq17v5a8u1o84kl1qg4qits5/sinetumadatasiwabebuzaz.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb61f4c7---rakirorode.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/58934221933.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/tokujeguvixoloveb.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/bodujile.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/renusupikem.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/25185891704.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/vinutezegogi.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/24453623040.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a181d393---tegatutolokojosovo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mubaxizufozote.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/crlbdfba124anrk0pj7cod31l1/65561772064.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88c128604---76529720112.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a7665e17f33---korunilamilumarirudiwigev.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/68988397335.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97119a059b---jivuminizibulaxo.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/nujixapirotan.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/26585823523.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/batome.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/fitabirurisaloxe.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/34403844619.pdfIn PDF document text
    • https://onlinendttraining.com/files/datebanodiramusixul.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/38918394119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=integrated+circuit+engineering+book+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_off0000bd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 10864 bytes
SHA-256: d61ff8fce40e643c045261874b7f01d68721c421a2abff51af7255e0f7519def
font_01_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 15836 bytes
SHA-256: e69312613fb9ad40a3102e189376e6e955a8c7ec368e500e2559ca763a61ddd6
font_02_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1