Malicious PDF — malware analysis report

Static analysis result for SHA-256 73769d267c596ec6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 01:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2aff3fe7b82bab193d8f2ec8eefe162f SHA-1: a51e19c5ac7cdeecca2636433962953e2e4aa5cd SHA-256: 73769d267c596ec66af51112e54399886ba8b01366982d1fe4ff3896b0dacf26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://maggievanostrand.com/uploads/media/file/21328810426.pdf In PDF document text
    • http://iwayman.com/uploadfiles/file/210907000049440575og64ga.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267bb3519c---62434855283.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/giwekowiretotalefifebi.pdfIn PDF document text
    • http://gerocuki.hu/user/file/54473410768.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/10248760289.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/manuxu.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/41422923573.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/vexapajo.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/rerinoxalatumukewasefuv.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/7577979055.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161304f75d2b81---vajufan.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/86485261737.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/77161298985.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/26228815064.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/91611603058.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd8cedbd8---mejafovagemuzitiv.pdfIn PDF document text
    • http://vodnik48.ru/content/file/6202426373.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/sozagolikanemew.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/maluziviwigufida.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/34075422282.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/tutiwesaxu.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/farotazupixudet.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109082127373498.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0beb2e9cec2816a11867e4ee3b2a2226/bomogugagitazita.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/digid.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9fdc2a5d---xidevoluluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+the+two+main+lines+of+longitudePDF link annotation
    • 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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 17220 bytes
SHA-256: 9f842c6e9d17b31fb827851bb287cf60f9d89c4605ec6401835d93007432c5e6
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 10980 bytes
SHA-256: f65e99359d129b4be39354a732a812e2e43774af90414b9c7e43c145abf2b82d
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1