Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f266b8bfec4ba4…

MALICIOUS

PDF

72.2 KB Created: 2021-06-28 15:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 370eb54e9712791a2e03951d73441dc2 SHA-1: 16c57f5715936422779e259c9a053fd6fadffdb1 SHA-256: 99f266b8bfec4ba495758a52ae6520a561ce460400bcb5e6fb963e3a4fbfd4f7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f95eeb874bba39ad347740c5d735ac02/deposez.pdf In PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/27603684514.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab91074b2db---fexadavoj.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ojr4jb12tms711998ku75nha24/94737810395.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/16886ec8d28d7a6750a69df5ef3b4fdc/zidarakogikegegubogukipa.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce27e6c4ff---42426495260.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9373adc8nn65r8k4l77oj1k57j/13229638121.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/ganavepegus.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe631ba10---tesuwukepuju.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/43389734761.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/38e6fee28a2defa9c9f16d3dea68a24e/45579736950.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/roruwedeweporemotinam.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/62000683102.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef45999b31---80305815733.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c9bbd2aebd26cd55edaec8fdfb225ffc/busikepusevepenaboxuwose.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/75558256402.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41bcd7ca8---69375784889.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd8ec4ef2b2a7d30e5f41d59f377add0/xanuluxitabadiwevirogemaw.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/388876dc2187a8548ab05449457e5a51/lanoritazevububigonanefo.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/9708109741.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/48e97502b93b296175a4b4c63122e378/80641152391.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/2504802071.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/joveponasaxufazulipuwata.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dup3355r9d3fc851angli7131h/38838892327.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/rqn0t0t875uc6epinv8r7tqhfg/texor.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92651d989---lepimegebogen.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/pugokinexogeragawafajuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=moving+and+handling+health+and+social+carePDF 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_off0000bd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 14860 bytes
SHA-256: a614c6c565a2aae05619290735c1c7bca52f16a88eae40b778f7f4cde5385d57
font_02_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 10708 bytes
SHA-256: e3a91d74f2e6336155baefbd01afe2156c7d525fff5a13385a7ba45e7bbb63b2

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