Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4ee50d0cd3146d…

MALICIOUS

PDF

74.9 KB Created: 2021-08-19 01:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96e24f4f8e45ed149c4ecbb8d2162f67 SHA-1: e50a58c650b6d5a387848cd47054dbf98c807582 SHA-256: eb4ee50d0cd3146d930934991ae90331d52ea2d54d4a2a75f2caa29e6ca9f88c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=yeh+rishta+kya+kehlata+hai+episode+song+download PDF link annotation
    • https://bomberosdenavarra.com/userfiles_nexo/files/gojibamemupuwevoxogo.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/giwigoxilu.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/zeviroxutojeputigaz.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/kirojameximolakefaxu.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/wizolimeserutelidojor.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/66409368798.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/31520929159.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607119b3b843f---2993470320.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/70105019856.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/24032965835.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/v1cbfcsr6qk8bjkvhpgj7fraim/duweraluwoxeje.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4e13763433091eb4c14cdf139fdf633/wagikabatiper.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/nakejukozov.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lodawod.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/96840419972.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca2131ec5c---fabudadoxoj.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0d4e0c4d60014dc5ca5cbfaf9ecd1b33/63936101340.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/5j6lg30kl12uj53mabar5pncbj/89969754700.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/98638601197.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/batalofanuzimopabutupa.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/32999438112.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51227545d3---riwaxevadeg.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_off0000bf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 16972 bytes
SHA-256: d37086e587f95f65b7715c3b7ee60aea78703e43db14992786478e2ca29ac563
font_01_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 10944 bytes
SHA-256: 4d24e7e72793072392b64083602112a06952f447234e5ea61437f85307bce333
font_02_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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