Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af1537e3a81e94d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 05:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c8dc5cebff849a17422774e83f7a997 SHA-1: 6cec0147b9309d3abd680675a707154dd5f10780 SHA-256: 8af1537e3a81e94dde830bb9583ba4f641456f23e40a41d579588778206d684f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://smidgel.ru/uplcv?utm_term=medical+terminology+complete+pdf PDF link annotation
    • http://wallawallahighschool1968.org/clients/75819/File/jogabuga.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/52985526635.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/tavabevugo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/97916c42af623345931a1099883feaa2/73188480310.pdfIn PDF document text
    • https://arerp.kr/data/file///lifinasijedevuvalexale.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/28/gafevigibemu.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/nopipalavalinufonidamolij.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/fatuzagurode.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca59ad3d58---71013390076.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/k3hui0n17jv98cifa4lr91hti4/rukexa.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a770c870ae2fd312059882e827de0e57/7082843881.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160787420ab45e---nepizewob.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc428df3a0---68263920257.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/59314411613.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/50af3a5af405d87d10a3630f083f98a9/37231707635.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/66622e8392e8f5eeaf780da2b13f0f0f/limidusigafukenawujoputiz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vmfqc30p34ba5r0m9klmfeumss/zuwutatexajokexeja.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b363dc2df74---buzatifurim.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d6cbafbd3783e1a45fe35a24f0079dd5/nivut.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79e07ce95---kudorarudi.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/14502491292.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/k0t3fb5jme4p2dfuqki3ca5vtc/zibolazirogubijigure.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c4494089---lowodolelovizudapog.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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 16928 bytes
SHA-256: 90460428bf293d8e26ba87d9fad5c03704563239513f41eb59a4e588c23c145d
font_01_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 10904 bytes
SHA-256: 28f04533387d246c0dfbf6da0290e5135fe0d8d42e56848f74eb8741a66743e9

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