Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83da733f1ff256d…

MALICIOUS

PDF

79.9 KB Created: 2021-07-26 00:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 134d578d094fe6ecdb996aa15793d794 SHA-1: 7284a0708290d8bae91cfa5496b09c11111bb107 SHA-256: e83da733f1ff256d3734fadd73ad8eb8c4a9db36e8d3c4b3c1e249ffed85eb92
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised WordPress upload storage locations and other disposable hosting sites. The primary purpose appears to be distributing malicious content or facilitating phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s8t3sr1d12t7q94e7jo4mmij2o/43417117159.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7169d2efdb73d0b8f0feeadee66c55b7/54586944386.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/v596i456f205e408lt55d0fvsl/muzixu.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210614_A011E0DE397408DC.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/ligapos.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/44194737718.pdfIn PDF document text
    • http://planetamama.ru/files/file/vawuwo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/46418e6129f55926e71428e11ba2cfea/kixawewanixebamab.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/9577540152.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f720cbbef---raweviwunakazanilazefoxo.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/88413994149.pdfIn PDF document text
    • https://anjingliar.com/contents//files/tajefowibojomejesa.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083613b8cc29---dexeramejotozuli.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/vedaxivajesanuluboxano.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b113982337eb98ff487b26f030b9903b/bonajezajak.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e62b9e1b234861b0a2fbc0725f0f4699/vatul.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/zesuriwadawef.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607624cc4e1d8---71616433895.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a404df3b6a---24195673197.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/3166160036.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/palubuwedaboxafire.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bedee1131a2---dobugoxofize.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/kosigejer.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pamejutojawukubom.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98004d43e4---bimed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fungi+and+bacteria+worksheetPDF 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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 10996 bytes
SHA-256: d4dcee92f541c2d9a0fb5d88e06ee3a6f05a5a52a3b5754f813259186ac7c4f6
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16220 bytes
SHA-256: 6d8fd315c5323c632ed8dc9fc4131d5956cab67f38da2a09d5345b40bdf53ff2