Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9144672f6a98e1…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 21:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ae8977223a4b5b84f788e58c45dea44 SHA-1: 17975fc2ae002bee24fac932a8bcacd40e36170b SHA-256: 7b9144672f6a98e1be66379465f00b9ab0cbaa5f6fb605665fee623ba50ed74d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16104b4af76782---75529559763.pdf In PDF document text
    • http://meyanko.com/userfiles/file///wamodapitojagix.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b281b687646---99974804715.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/1984139983.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076936dd380f---toralezenije.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/plo4au6kur17avvau9c2md0ep0/zetatosupexi.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/tivafifevenaru.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/buzejuxabogujetatuvixexom.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/tivapivesotipokudesugiz.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/nunidutagoxediza.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/vivugusev.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lubawalowasumogigulam.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/33seleniq23gr6lsvtmegk2mj9/94905615292.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c5d795ae60c309c7ca0217bfa8e23f5f/xodibuletanugafenibumubo.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/747bfe1e095bbf7acc104b50e2209c18/43097229690.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vonojisewi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995c3edb7aa---sopefijurisoniwetakiz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5ca6e54ff496fa5a348b40ef29428df8/92580243909.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/pibisenukoxitev.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/ripuvawekiritewobagi.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/tinamun.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/11697e318b6b0dbce02c9248236f10f8/zutunuxovuweput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=heating+and+cooling+curve+of+water+pdfPDF 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_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16976 bytes
SHA-256: 177b823b04c8eed82787fb5c56495b184089df17b4044166e9efaaf24ff1de92
font_01_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 10868 bytes
SHA-256: 645551b6eccb58fbf79236a31f9eb5df97932055230f0a3d7eed5339bb140420
font_02_sfnt_off000136c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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