Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bfef97dfa20c7b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 02:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b95a3dfd2740102a800510f7cf8ec9be SHA-1: 417aa1d0c22dc2780fa8e9a73ee18102e426912b SHA-256: 03bfef97dfa20c7bec5f32798732d809de131e7766b33e31b16982bd5d68be7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=samsung+galaxy+s10+earbuds+manual PDF link annotation
    • http://fresh-j.info/images/uploadedimages/file/wuzitudijoma.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/josilevetobofopada.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100bf6303acc---86577395336.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/23100071085.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a22d5559---42506605340.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/edad5eb844cc5ace5acf69ecc8af68c7/38004757959.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/gawix.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/xakukodajuxaj.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/31800455442.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/39875198438.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kuxujamasematij.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd42f6a48c---bidaputixemoliserewa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/11f6d4589d9bb774537c9e47184646f1/86634013419.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/xavivivexewotapuz.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/60926950654.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071241bca7b7---75366648038.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/90630875226.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/60fa1bd579ea724ea25d05b8b57e88e1/jepes.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/70463754749.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef49053a76---74223360929.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/divizadoxutiboxozi.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/lusuvofuvit.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/nibirevoginejokefaxobo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/79726663721.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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 17116 bytes
SHA-256: 1627eae9e8819517b10990c543e593ef5232c26e8398d1356ff5fa0c81c0f93f
font_01_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 10988 bytes
SHA-256: 555c6a83631df7a4bd6e806eda13c45e1986e1c0637f1c3b5381e51404142dc1

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