Malicious PDF — malware analysis report

Static analysis result for SHA-256 850995ce9c6418e9…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 21:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c1a1cb536737bf8591c6b6c16853b62d SHA-1: 738e24cb7bb23c329d1daf3b7854550d779dec54 SHA-256: 850995ce9c6418e91ba1c37c4d5eb1359e3b1d50fc444195baf28edd6a77fee5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely for SEO spam or phishing purposes. The presence of multiple links on potentially compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160864c29b0528---posajisejap.pdf In PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/41958189741.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/43402012015.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7a17a883---puzogawu.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zifonebunudose.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/supoteraguzibix.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/83946347848.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/r80ourhjmcpgktbqtbdh3olub4/janoralubotegobejeveg.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082128dd5944---dolomadiwa.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5a24cce542e527ef478c24c568f8d219/fokop.pdfIn PDF document text
    • http://billsky.ee/files/file/zofuzemefatekekumobip.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9b00c6ef4---31511752732.pdfIn PDF document text
    • http://hongdacable.com/d/files/nubanolamadewa.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/48670944970.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073a98ade324---zazezodisi.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/borogenagawopifunamusaz.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/42033760627.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210605_184215.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/59017257156.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/57494a2dc94d43c7e26b19b31b0d1a84/rekum.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/82184077174.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/orfkctq2hc1e0647n22ngdvgei/dadajefalarimabud.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/bafum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=botox+made+out+ofPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/43020424378.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 16912 bytes
SHA-256: b04e921b19877ac06c65c91ae4fc587a8e3cf4714cffb7a2fa79a7287f7f37f0
font_01_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 10260 bytes
SHA-256: 34551721f7654f1cac8da5c2c81de23e0e5853243aa3344100efcd3f29b66313
font_02_sfnt_off00013b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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