Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23fbbf9af52ccb8…

MALICIOUS

PDF

89.6 KB Created: 2021-07-13 23:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e7aaf7d3d20c7236b39c1c75d6a102d SHA-1: 38d2d2c8959cef4507d8079929d2617768efb076 SHA-256: b23fbbf9af52ccb807dfb5a7375518d52634681679672eb87156ae98465f9ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

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 https://medvor.ru/uplcv?utm_term=what+is+nitrogen+a+metal+nonmetal+or+metalloid PDF link annotation
    • https://vestol.bg/files/file/jodibaxuvizoxew.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3480c420---74507043925.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/57ee343710d59cdfd2970d396b46eeeb/83020074573.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zezewadoworazuboduxe.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/54b2a83179862168ea2ec74ec2d3a471/11223201852.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/vurasudu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32dace9df---zevodimijavum.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/70941660178.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae081591f05---25846550578.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-26/20210626025130455830.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/af82aa16d1f225afe58dc378f16bd3e9/56693930379.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/50505583225.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/2932647189.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2145ecefef857911a6b844c5119a6e57/gisot.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952e0de02b---27644336463.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d237ada4b2---voloxapukoluvar.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/ritawikolejifasojebategug.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dea04ed14---19500140676.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddd89717f---jinigur.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607178c78b2fd---zafugajogelev.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fg2ucavhut1rs97a4b05v83306/tedilofekifovum.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/13254082991.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44df9bf735---99693673484.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/24494807580.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_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 18732 bytes
SHA-256: f1f7b2e9bb598ca9ffc401018376ec8ea23b58446e15e9bdaf566780e71e0245
font_01_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D9 10688 bytes
SHA-256: f0318032e1c02b5e66cee7d18e7ad00975856474440adc8d834e8afb002791ac

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