Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba8b2a3fa31190d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 21:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f54cf9620bddffd453f9b95ef2245420 SHA-1: 1c0e4b11186685afa858ad50c73db67daf0b95a1 SHA-256: 4ba8b2a3fa31190d0bbfcb40ada65840ea4e335c49c8fde4057486a2f0c1c970
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress upload directories. While no scripts were extracted, the presence of external URIs and the link farm structure suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f1a915c0---26525056185.pdf In PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/52942884228.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/68298108585.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/dejozab.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/rogodogelipak.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/kusawepoluparod.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/96001037822.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091214080673499.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/nosipegubofagupeped.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xabesirajowoxeb.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fbc245380---doloxajariz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ac4d9ce0---74527681003.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/jifexorovuz.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/pilunafewavizab.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/78402498209.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/pinoxukifuwilamibaril.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/fewavojuratozovusugalub.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/47436425233.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nogetunipexoreli.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9be6116b---17512337124.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109090826528765.pdfIn PDF document text
    • http://zgic.ru/!upload/files/dimagafoji.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/31593030304.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/47157645934.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jogexagipizopaluz.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///divagoxoxejitebowosamusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+complete+numerology+reportPDF 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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 17848 bytes
SHA-256: bdcdd9494bf4d95399a60127980639362f0de78baffdfff0217e155e2a3e8d72
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 10484 bytes
SHA-256: 8e236fd6fe8758596aea6d2813f641b8d27d70d9d98f6b91a9d32545f7882d3c

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