Malicious PDF — malware analysis report

Static analysis result for SHA-256 218e9f2a38ae69d8…

MALICIOUS

PDF

89.0 KB Created: 2021-06-13 02:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9495886d0573b3ed1b340fdb1bc390e3 SHA-1: 13fa768a10c8bcda7cc617454bda446fb4cf5de2 SHA-256: 218e9f2a38ae69d8bdbf36acc8ebbccd61e80741d0287c62ddb2596df1348765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=delete+wantmatures+profile PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a352f4f9---gesusubuwovidizozem.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/mixumob.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/674n3aq3n3j94g3g3jsli4ftj0/31336795170.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ifofgcavc0rvc1h6etha7rbm7f/sibixunol.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/mugakeb.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a910d15702---memamokuse.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609212d374a70---kuzadavopefupowigejugexu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bt9nrn78vt3ttt88vodvdkdl5h/1864966389.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f51f14ee8a---valapanipazutewujuzo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08a457971---8598215572.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/35872002986.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3698c7bf0d---52742220738.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/tezapufone.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/radedojikule.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//25443173566.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7899705d9874a807149ce792b68cae6e/lesevojeme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 5140 bytes
SHA-256: 73252e083ba563ece0318befec87a887c624e567411317c6ff34bd763ee16607
font_01_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 11688 bytes
SHA-256: b9170524ec0ee6f322ca7b1ec8fe2805eb8680a35ff580c291b9c9bd4575ef4b