Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa36a5ca86d30a04…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 20:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a09dadc68731758eeae5585f674d79f9 SHA-1: 96ec109662d40b97ad4be7a882e89a5ca8481ed8 SHA-256: fa36a5ca86d30a042a6eda1760b346655f0764371c32023f335ce182f015a287
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on various domains, including compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely intended to lure users to external sites. While the document body is heavily obfuscated and unreadable, the presence of these link farms suggests an attempt to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://swalaya.in/userfiles/file/doxivu.pdf In PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/zawat.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/wasuk.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/63461255530.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/15298005387.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/97616327602.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/69009454980.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/99930529227.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/nuvopelepijej.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16139946bb3da1---99264172064.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5ea95144---79154255875.pdfIn PDF document text
    • https://kawanmto.com/contents/files/muxexekizefidake.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905104814346019.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/kukogakotipuras.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/vaninuxiwodifa.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/83525488700.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/likavotesusebusijexu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/pifizobuxonadovuwejiwoj.pdfIn PDF document text
    • http://vaynhe.com/upload/files/votagumigigug.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368644e535d---34280817026.pdfIn PDF document text
    • https://majubesar.com/contents/files/satubugevujunogofumar.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/81015767731.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fupaxej.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/36251139183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jurassic+world+the+game+apkPDF 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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 11128 bytes
SHA-256: 31963718ad86fdd0c1197fd0247266cf4efc2bd2f8c0137608d5fee38fdf3cb6
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 17632 bytes
SHA-256: 8d5d9e9653182011d723582b2cd8c94f4e0427bf6cc3d610142f7d93d869ffab