Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9de1ebb606a1bbc…

MALICIOUS

PDF

87.5 KB Created: 2021-09-23 23:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3c1d539add57692fd1fd527e6d09a6c SHA-1: 71dba2ef3d058a23915e1074e9d73edde2f82c8a SHA-256: e9de1ebb606a1bbcdb1c3ae3e16ca40f88bc2b9acd3449e1257b662ed839eeab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content or phishing sites, likely leveraging the 'free robux' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=free+robux+2020+no+human+verification PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g2rglljdk5u6calsq0eg0u58g0/30927838309.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/31923828319.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7c90b3e13a6fa25dbc22a892f6a3078b/31435719569.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/45638442041.pdfIn PDF document text
    • https://gulamanis.com/contents/files/zarodugugogob.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jagomuvadosuba.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e49f5119d---mazofoju.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/navodozefapuduzetifo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/2792896571.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/wewoj.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/bevelitumuzok.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/xavatamiza.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/87056137071.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/51878317971.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/45227434695.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/64775546734.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/14280485312.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402c44c55b4---zuliwoxanitozug.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/rowejeloj.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/17077356007.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/69149254580.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-05-19-13-46-djIWlAme.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fuvuledatesesa.pdfIn PDF document text
    • http://ombs.ru/uploads/files/zoxufuzuvolifataguz.pdfIn PDF document text
    • http://airmon.hu/images/files/roxagebipipiw.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-10/20210910220823473931.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_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 18284 bytes
SHA-256: 3d837ff5e51ca3b437bec3fb5ae2d00a5df5ca69d705582c78a3d16fc8e44dd3
font_02_sfnt_off0001366a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 11016 bytes
SHA-256: 8810298c97a1cd4feff3f9712a03d8eef90177e6831feb41c528ef2b1c76ac13

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