Malicious PDF — malware analysis report

Static analysis result for SHA-256 4258520279ecfba0…

MALICIOUS

PDF

86.6 KB Created: 2021-07-08 06:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b285cd204f9e3911d17d8bbbe97e0d7c SHA-1: 2b8c59c83fbd4c7dc6c66e4ab221cc82746ae221 SHA-256: 4258520279ecfba0ce7af4bdfc9a5953143e55b7256eb0e6fd025945e6d39dcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the nature of the links suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6dad0d2976ecada4bfead3f06bf60c40/76547092010.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f637fc45---wasolaxilobusivame.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f768ac9b9b212bbc17d7017873fb4824/83808267927.pdfIn PDF document text
    • https://unosms.us/userfiles/file/52797208944.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/rixejobavadebaxogamuja.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607223c0aace5---50945405935.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/i4b9e8iq9dq2u64m2583hlgdk0/nimapivipakodaresib.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/91325481935.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/sobigobomomuxabiladupap.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae026cdf901---jirisiwilawosefijujununi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2129cf54e---jopusotaxonixamadomibus.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10095327c5---zodif.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/vegawuno.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/jofojujetoja.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jigexewodiviw.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf4bce4514---67351995243.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d08e708d---karibobekiponu.pdfIn PDF document text
    • https://argumentua.com/i/file/jofugifunitomaluriguzufaz.pdfIn PDF document text
    • https://airbays.com/userfiles/file/risopefipagolagobosalizad.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t10r39mk4fgf34iu1iovpuba1f/tajif.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4484157dbc9afb4153ec1a053d28ca09/dexegifamaba.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/48823902323.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/dugusuladuxigunaninovova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sample+21+day+fix+meal+planPDF 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_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 17520 bytes
SHA-256: f498ab359259cf794cfd16d646bf21cdd911ec793c972ceb7cc5db1794d01e94
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 10636 bytes
SHA-256: 140b8902412905ece9c99bf7a3acfc3f7c9acc3ee9d5a1cb7b32931e3aa7545c

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