Malicious PDF — malware analysis report

Static analysis result for SHA-256 538a0640c92892e6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 23:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 47d14a6574a8fb03fc69f51dec834a7c SHA-1: 36fe35302727fc745f604413516f6faae66a08e9 SHA-256: 538a0640c92892e64e4221ffb7b421a5337d60cd77456d29a9e63a542cd10752
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests a phishing or scamming lure, likely attempting to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://irlanc.ru/uplcv?utm_term=prank+call+voice+changer+apk PDF link annotation
    • https://bearings.vn/images/ckeditor/files/winewixaporakip.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109020707551985.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/60345338323.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/kavofutafujebof.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupujo.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/zewekituvakupisekuvatij.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/29355907074.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/mavitelulimefoluzivewoti.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/9912268974.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16142080e9cbbf---68276534612.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/78618917372.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/wuzelonikokedalat.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/55310020671.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/zirubifokisezida.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/nuwinupoposibezege.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c4187bf0---97787530576.pdfIn PDF document text
    • https://matrixx.lu/images/lonamabet.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a143daa0c7---jifazovujemigugujazawudaf.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/62320962844.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442e77a999c---15564910742.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/22348157816.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/fafebenedifotituvufe.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/85209697241.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/84369505208.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/pesaso.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021919550348755.pdfIn macro / runtime command snippet
    • http://archifolder.com/userfiles/files/59800827711.pdfIn PDF document text
    • https://guptajimarriageIn macro / runtime command snippet
    • 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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 19176 bytes
SHA-256: b79e99f86dd7d834d5a96f3dc95497ecb3ca1499710b9a118a51852d3aee8865
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 10548 bytes
SHA-256: ba663b7b21fcaa1611ac63220bab5a9df34111ec2a18b53f58180836928f30d3
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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