Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2000e70df7224c7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 17:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da79ae5a75c0cda7db0ef585e2d46bec SHA-1: 42199048a66db58910819c75bf941899b18f2f71 SHA-256: a2000e70df7224c7a1847fe5dc9fd76562bff5333c050cd5ac150d8653534332
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 ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further malware. The presence of link farm heuristics further supports the malicious intent of distributing links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kechengchem.com/upload/files/19085103694.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076747697d5d---wamoforoso.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/75045037051.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/sotunagijop.pdfIn PDF document text
    • https://digireg.sk/upload/4487814832.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/ludopowejife.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/28125132837.pdfIn PDF document text
    • http://deauville.ru/files/file/84226011324.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/2822844.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/jp6c0mij3fh955qntu612drp76/26766950886.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/df2d0fbe33e7cf2c83997b26e4fc2c14/gexezivuzibamaruvu.pdfIn PDF document text
    • http://sam-global.ch/files/file/55497049413.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4c8b8d36---lepawijojumolivuge.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/jifakizubasinagir.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/davilekixubabikew.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/lubotamov.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0a52bcb4331cf0121251234467070314/kavofifejaferifuwik.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/2600982251.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9db7be75---sagamisubetivuwepikekewos.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/71061817458.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4f34c2d40782a94b24eb989de634c5c7/23649088652.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/40405038202.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1aee633ebb2380fcbf363369622e7009/punut.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c598f23296e---19518931151.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/82317558393.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/31901452211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=perimeter+and+area+worksheets+3rd+gradePDF 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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 18520 bytes
SHA-256: f0f75948522e4fa30ba4d905222a7601a884d4e5d27edb51e844dfd240b3604b
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 11000 bytes
SHA-256: b7f277785038db304d13f9c31c15623dd944d90a55989384e505d157e59509e2

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