Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b50d23659628f9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 04:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 437f9d84ec1188625e3c2f370960fc26 SHA-1: a73ff918686e6b23164748ed9c2ea04336bf339a SHA-256: 27b50d23659628f9fdfe523147c2adfdaab0f7b7f010d5a16a03517b64489760
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains numerous links to compromised websites, many of which appear to be WordPress installations hosting PDF files. The file's structure suggests it functions as a link farm, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=adobe+illustrator+book+khmer+pdf PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e88e5931---60785745777.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a25d81bppa7p4u59mcjetfncb1/zupof.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/xuxaniwugoniv.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/18576727237.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705a4dcc96d---84050423786.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e603b56ad7---dabilij.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072795de145e---peparobinisibilaxajuruwop.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160897843bb392---50864954690.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/51841894945.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/nubiwujitoxagovevoxidabe.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/61841688928.pdfIn PDF document text
    • http://artside.org/data/temp/file/legevodomidenato.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/62561294250.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121723a63730---notunaxoxomotavixo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/268100aed45afb6bc6c911fbc4a9b671/jaxasutobuwetodarivuzelig.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210624123756515.pdfIn PDF document text
    • http://gardatrans.com/content/Files/4547149077.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/silemopivudixejukoreji.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/malukobelusese.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/befiloxowuximijoz.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/selefuzamusexo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160def88f6239e---sopovonus.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750dfd294dc---65289299167.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/96429912934.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/tirikixesesivovepopilu.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 19984 bytes
SHA-256: 27a900de3c1ee2c0629c9c3ffe8d6d8143a343ca8495a764ccc8fb43b7460cc2
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 10972 bytes
SHA-256: 5219200893f7810af567632bcd2be38700335a5ddc00ced3bb824ae71ee175a8

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