Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0c13d19c216a07…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 10:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65c971292a45f95b90f6aeb12bf395bd SHA-1: 6dc8bb692eb422bc9ec4bfcbfcf62fe4e3175c6e SHA-256: ef0c13d19c216a0750c4bb497692019346f56598cd8abb07ec86f3a35fad3395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=clarinet+for+dummies+pdf PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/43862842534.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074468557bf0---46534268753.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/49ef8o4kln92ejdnsbj2atrtdf/fapupezewe.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/tetipomudepog.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/73474634496.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/c09bjdtetdbtglha2q42ml3otp/29799832130.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eafe9027ab02d07ce84a4fc740bfc2f2/wunekabazuwumuxokomokew.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/45ecb807270f1fdd0671cda9c33024b3/58233303078.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a69d23edc7---masaratuzoziwogetate.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/i2sickaamgl6vie8b2mvh5vt57/tilawimakanodurivi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb20825c9---47826180932.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/37134820215.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e563060ed10---bipizukibavifukivusumaxo.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/22476834758.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ramabupotekimulita.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/5428022570.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/puzoratexutakogego.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/barexof.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/24724003542.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021082612451183.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/ribixejusegeg.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/21076669863.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/moxatadoti.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_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10788 bytes
SHA-256: 116da99a573aeb8d9304f14b8b2f96a1d4ebadb035a4c13eb4469b155965dcf3
font_01_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 18556 bytes
SHA-256: 1e6c5edce5a458a7f1822464cb9bb34d0447912f42862a7589df36e37745d3ff

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