Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dde7f033c957f7…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 14:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e4f83975a8b1f5aa75bce04590fcbaa2 SHA-1: 11d662d00184f4bd5cb0ca7748eec711d6e1893b SHA-256: 71dde7f033c957f718b2e565c47e9ab76522887ac0045ac21dba2b343cd09cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures to download further malicious content or to phish user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=moment+diagram+table PDF link annotation
    • http://bbu.vn/Images_upload/files/63647674489.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9010bad69---nikokiwoverowabalul.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31f49931b---31113825468.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/80072731425.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/jinidawomi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2677c9c8---daxumekibik.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae3c9f335---86524446377.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baa46eaaa5c---dibaranopadomozi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf503f65c3f---pomejejukobik.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/58663662837.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/kenukejes.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/7be5efb9d84e9731d21a5cc02d98193f/90214681347.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5bea6a8c---45554461067.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8128509c9200391d5c8caf5d1fd70728/rujileposedeko.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/713bba881b8f40939df3d1cf0e498f2c/zapuluk.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/20f861154f096cdba88b4b4843273e4c/zusum.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794791ee910---87370459952.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/naxozexixubilawobud.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c0c68805b00f0dad1f8e8b0445b3536c/82627612692.pdfIn PDF document text
    • http://berbun.com/user_img/file/65752287514.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xubetetikekuzaxofus.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jojuz.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0t6kn54lq3tg01voggnfcvtfu/vivig.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tomazalefusaxar.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cc9b67d1777c272a596ff6185c2e9a75/dowotitalagono.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d7d2b02---rebozitijefeduva.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_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 16604 bytes
SHA-256: d7d0fa6daf908ea525b45e2c8409686b7bc3b9d3a8fd16dcacffcc003836027b
font_02_sfnt_off000141b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 10556 bytes
SHA-256: fc46eef1ae19f3025eb464dbebfdb3f217efb6830bb89c7f876b86ede425d67a