Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b45369315ffb649…

MALICIOUS

PDF

89.3 KB Created: 2021-08-08 03:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e71e5f20ef8322c0e3fdbb53638222e SHA-1: 7561ecdfb4897782b767b83bc9381b09b5a449f9 SHA-256: 8b45369315ffb649c6fef32087a357a6ea01c876af0304ae8ac9ac12299d03ad
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF contains a link farm pointing to various compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=la+biologia+de+la+transformacion+bruce+lipton+pdf PDF link annotation
    • http://www.grupoaccs.net/ckfinder/userfiles/files/nopibamudotizijok.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/44042021124.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/94417921026.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/kixajaraxurene.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/16549530990.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ef8d105211da01b03901ed0fc5fbec73/32669992820.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/918d3b0609088e03cffcb4804937b4a3/85103386816.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/063f296f5732872acb371413cb4fcb55/fugatapobikodumanavufema.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c866f40ba84---6613289050.pdfPDF link annotation
    • http://bestpokeya.com/uploads/files/kaveper.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/xirorugapemowetizirito.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/87553570435.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7f8fe15d8d2e0e9c4fd63d28e9d9cf51/tedokixogure.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d397cf4e1f093a1807bfef471f17e396/56726633633.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb2f5bfd1---soxusup.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3f913bfba17d8cbb3f6c601389be4843/4781218368.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e302430aeb---fozarikovezoravebuzadusuw.pdfIn PDF document text
    • https://langumeistras.lt/i/File/mugogukorujawigenud.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c000f1b972bea17d04998188e5f15e86/17050324643.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/33680307606.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/11784606264.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/gupefolarero.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/labokonafisexisexu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/q4tsj87jn0ptke9ei7heu7c8bj/zerataje.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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 19632 bytes
SHA-256: 5192d24be227a95042b551c2ecc365585b7dfeb2520d7da03b11c9b996c2faf2
font_02_sfnt_off00013b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B72 11160 bytes
SHA-256: 6f61b4871403060de1ce7b747312f86f12731093aa5dfc037427753e4780baec