Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b84ba81ba5754f2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 06:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c42b3c3d0e36385d4956ef13a3dbe1a4 SHA-1: e6cb127915df3411d6e0114a92b362aa9eba15c9 SHA-256: 4b84ba81ba5754f257edbb42081b388c5fb251e2df28a258813a34adb3f678ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=merging+two+pdf+files+windows PDF link annotation
    • https://ayurmitra.com/files/file/70640252933.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/11890868698.pdfIn PDF document text
    • http://gyobel.it/public/file/23205106781.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/gosafisagixobokabadi.pdfIn PDF document text
    • http://qdjshg.com/files/file/10963085826.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/zemiwosiva.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/kenalebifemolarato.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611434a333fea---kiwodexakepewepuxuvuvalob.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/54341008939.pdfIn PDF document text
    • https://olterus.net/contents/files/medugewugorelulunefa.pdfIn PDF document text
    • http://live-net.it/file/83340943994.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e165e156d301fff8fbb80f149be5ef7a/40808494164.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3137460e93---14833451265.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/dumeponopud.pdfIn PDF document text
    • http://df-foundry.net/d/files/8767540153.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/epas192bi1q645ql3sgqbjjqk7/megasujiwijisuxiner.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/27535384117.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8mhbb5ipskm1ii5amcfh2priv1/40461443803.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd96e7e184---60565236564.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/51362056806.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f291393cbe9---nuzoboguti.pdfIn PDF document text
    • 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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10592 bytes
SHA-256: 7b9801a44c3b51ba3209f04642d0d41e1c66ed22c434d641d809aae0a19db573
font_02_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 17800 bytes
SHA-256: d8fd202f1a3b0ee386e34132f0f22561477d411c61a63e65bb79f9b250c14f83

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