Malicious PDF — malware analysis report

Static analysis result for SHA-256 304d3ee50ed41628…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 18:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b5f6f6e028bb350443c136a81b52f06 SHA-1: 1ab97443da061ce4ad52fe5cb8ed7852ca11a17f SHA-256: 304d3ee50ed416288866e797ea3b417178af4ffe20fbe7e7a0e57db6c78ddf9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://antropolog.ru/userfiles/file/buxivaxidale.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c55ca78fd---dukezunegabevalozuxowip.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/32522007318.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/zusotawubazinuveponazibex.pdfIn PDF document text
    • https://ratosatu.com/contents/files/19356865644.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/89577786250.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/9070253073.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/34aab6337b8482d274ef2b214fa9a99c/6591075818.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/96239716374.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/wikidoxapagumodosazexuz.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/89742575705.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vuvemapamepazupakuposus.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210907221240.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/42336468529.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136814330df4---liwelotobo.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/12392064740.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/lenosagagupopu.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/zitomuxal.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/72935003454.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/dipokonajirom.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/19976998870.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/bujixedugarilop.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/juxewogokapodirikasavug.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2555c8864040ac75d86a0dc615e33d28/37071380545.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/nijamor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=john+wick+3+full+movie+live+streamingPDF 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_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 11292 bytes
SHA-256: fe50817dfd4bc11030e4c60a68d6a6ef051c8031d40e55fc4cd56ccab9d92e17
font_01_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 17360 bytes
SHA-256: e7b675020739287570c9a89b3978f589dd12d16149bb1e439dad671db07094e8