Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e27937e9222354d…

MALICIOUS

PDF

108.6 KB Created: 2021-08-25 23:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ec6da808212ebcd7d497ad9c3092f331 SHA-1: 3c825a552a42226e224e5807857c4c5d4bb8859a SHA-256: 2e27937e9222354d6bfa7e35b0221a3653b836bb6da41049692747e92d5bf457
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous links are consistent with a malicious link farm designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://chcial.ru/uplcv?utm_term=reading+a1+exercises PDF link annotation
    • http://petgears.com/app/webroot/files/file/foxanuxipoxikuroba.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/61196070419.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vk6trk0aou7o62jb0c3j3qs1v9/mijilufawo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/bulumitisumozanob.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/relunarikelafalas.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef8039767---lezosugu.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/66288247695.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/mexejajemixizaso.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a9bb44f6---59910961276.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/zarimaresaj.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/42046604689.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/texewezefetazaxe.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c8527df5ce0fd1c16e1ac91ad3d36d76/pagotizilirikazopufujop.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/30215993728.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/93078105173.pdfIn PDF document text
    • http://theurbanthinktank.com/files/zawetapake.pdfIn PDF document text
    • https://mahae.hu/files/files/70399689740.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218a6667a45---40051204781.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/notutosefokapadelixudavuf.pdfIn PDF document text
    • https://norservis.info/files/files/welatonixaguxazetu.pdfIn PDF document text
    • http://alkanboya.com/files/file///padugosudanidiveger.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a3f789e265a8be6cd7f955ac998461d8/wezopek.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4f3827ceb2b5eaa893a841fe316e4de6/vozokupifirevolenun.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/lozawekigisofujebuwebef.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087742704fe8---4177958669.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_off000143c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C6 10480 bytes
SHA-256: f904cd6182030925f1f9ff9963d632e2678d1d04dd5cffe666816d8d27b012f5
font_01_sfnt_off00015b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17394 19592 bytes
SHA-256: bd056d5d4188a0058644896a3b1c4e8c179c03528af9bd08d1fcf2cdd1745561

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