Malicious PDF — malware analysis report

Static analysis result for SHA-256 997e6f71bb31a687…

MALICIOUS

PDF

86.9 KB Created: 2021-08-23 15:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61bc63cdb4c8539c4d9fca71e096235e SHA-1: 5ae54c2bbf80ea07efe511f98d7e3dd341fd1d25 SHA-256: 997e6f71bb31a6870ab491a3b2b2c09c70063c46eb7787e2f70648ab3fd4f7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs to host a collection of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=prayer+for+discouragement+and+depression PDF link annotation
    • http://rana-international.com/userfiles/files/wafogi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/34731115105.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d36a75b5f2---bexonusig.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/55fe4b6935ddc58a8548cc8639cebcff/72517334971.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dd55e999---69219940532.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/61489007243.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/fagesovipe.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/kunopag.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160742f2841733---konofadulinoj.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/39731917232.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/17523823798.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/zewumarow.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/40732711029.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vopodigajererim.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/55501555973.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/vutusorijafop.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/boxosolexime.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/39245778415.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/69549517402.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/rosufukilepujekifufi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/rupategetigizopuwonuv.pdfIn PDF document text
    • https://premium-house.uz/images/file/puxaxawutiwotenatud.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/vazubixotajixa.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16860 bytes
SHA-256: 89dc830ee714e4b7660b9e7b7770083670a3259d25f0c642858eef844c8aee42
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 11132 bytes
SHA-256: 6800dc6079a2fb200c8fa16f0339f64e860237e23b8dd55dcdb614d0c63aa55e

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